Eurooptic vortex burris nightforce sale




teslong borescope digital camera barrel monitor


As an Amazon Associate, this site earns a commission from Amazon sales.









February 25th, 2024

Sunday GunDay: Great F-TR Rifle With Borden Action, Cerus Stock

James Crofts CigarCop KW Precision Cerus Walnut Laminated Stock Borden Brux fluted fluting Phoenix bipod

A multi-time F-TR National Champion, James “Jimmy” Crofts is one of America’s top F-Class competitors. And now this F-TR ace has a stunning new rifle in his arsenal. AccurateShooter Forum member CigarCop, head honcho of KW Precision LLC, built a stunning F-TR rig for Crofts a few seasons back. This handsome, top-tier rifle features top-tier components: Borden action, twin Brux barrels, Cerus RifleWorks F-TR Stock, and Jewell trigger, all resting on a wide-base Phoenix Bipod.

James Crofts CigarCop KW Precision Cerus Walnut Laminated Stock Borden Brux fluted fluting Phoenix bipod

James Jim Crofts f-class f-tr rifle brux borden cerus
James Crofts photo by Kent Reeve.

Have a good look at these photos below. Yes, envy is the appropriate reaction. With the smooth operation of the Borden action and the predictable accuracy of Brux barrels, we know James’s rig shoots as good as it looks.

James Crofts CigarCop KW Precision Cerus Walnut Laminated Stock Borden Brux fluted fluting Phoenix bipod

CigarCop actually chambered two barrels for James, with different fluting patterns — conventional linear flutes for one tube, and lines of staggered ovals for the other. Finished length for both barrels is 30″. Yes it looks cool, but the fluting was done mainly to save weight with the 30″-long lengths. CigarCop tells us the complete rifle, without scope and rings, weighs just under 15 pounds. Max allowed weight for an F-TR rifle, with scope, is 18.18 pounds (8.25 kg).

James Crofts CigarCop KW Precision Cerus Walnut Laminated Stock Borden Brux fluted fluting Phoenix bipod

To learn more about this impressive F-TR rifle build by CigarCop, visit our AccurateShooter Forum and read KW Precision’s F-TR Gun-Building Thread. The stock was created on an automated CNC milling machine by Cerus Rifleworks.

James Crofts CigarCop KW Precision Cerus Walnut Laminated Stock Borden Brux fluted fluting Phoenix bipod

When James Crofts is not shooting his .308 Win F-TR rig,
he often trains with a .22 LR Rimfire rifle. Read on…

Rimfire Training for F-Class Competitors

2014 and 2012 U.S. National F-TR Champion James Crofts is one of America’s top F-Class shooters. A member of 2013 World Championship-winning F-TR Team USA squad, James knows a thing or two about long-range shooting. But you may be surprised to learn how James sharpens his shooting skills at relatively short distances. You see, James often practices with a .22 LR rimfire rifle at distances from 50 to 200 yards. James tells us: “Shooting my F-Class rimfire trainer saves me money and improves my shot process and wind-reading abilities.”

Remington rimfire 40X barreled action in PR&T LowBoy stock with PT&G bolt.
James Crofts F-TR Rimfire .22 LR

Rimfire Training Teaches Wind-Reading Skills by James Crofts
Training with the rimfire is extremely useful and can be done from 25 yards out to 200 yards. I am lucky and can shoot 50 yards right off my back deck. That is far enough that any miscue on rifle handling will show up on the target. I use a two dry-fire to one actual shot routine for my practices. This gives me much more positive reinforcement without any negative reinforcement.

Wind reading is extremely important with a .22 LR rifle. I use a set of smallbore flags to aid my wind calls. The smallbore flags are a must and force you to look at the flags and mirage on each and every shot.

James Crofts F-TR Rimfire .22 LR
This Rimfire rifle features a CMP-sourced Rem 40X barreled action, PR&T Low Boy stock, Jewell trigger, and Phoenix bipod. The gun was built by Ray Bowman of Precision Rifle & Tool. James Crofts told us: “The project turned out awesome — the rifle was a hammer from the beginning even with the stock barrel.”

Rimfire Training Is Cost-Effective
Rimfire ammunition is much less costly than centerfire ammo. Though .22 LR prices have risen, you can still get a 500-round brick of decent ELEY .22 LR target ammo for around $70.00. That works out to fourteen cents a round. That’s a fraction of the cost of handloading .308 Win match ammo, with the price of bullets, brass, and primers these days. The top match-grade, .308-cal centerfire bullets can cost around $70 per hundred. Then you have to figure in brass, primers, and powder. Finally you have to consider your precious centerfire barrel life lost to practice.

Permalink - Articles, Competition, Gear Review, Gunsmithing 1 Comment »
November 8th, 2023

.308 Win vs. 6BR vs. .223 Rem — Recoil Energy Comparison Chart

6mmBR NormaMany visitors to the site ask us, “I’ve got a .223 and .308. What will a 6mmBR Norma (6BR) give me that I’m not getting already?” Well first you will probably average consistently smaller groups than your current .223 or .308 rifle (assuming the 6BR has a quality barrel and trigger). A good .308 Winchester can be superbly accurate, no question about that, but the lesser recoil of the 6BR works in the shooter’s favor over a long string of fire. Even with a Rem 700 or Savage action factory action, a 6BR with a benchrest stock, premium barrel, and a high-quality chambering job should deliver 5-shot groups in the high twos to mid-threes, provided you do your job. We have one 6BR rifle that shoots Lapua factory-loaded 6BR ammunition in the low twos and high ones. That’s exceptional, we admit, but it still shows how the 6BR is an inherently accurate cartridge, even with factory loads.

Compared to a .223, the 6BR offers a much better selection of high-BC projectiles, and will deliver considerably more power on the target. So it’s a better choice for hunters and 600-yard benchrest shooters. Compared to the .308 Win shooting 168gr MatchKings, a 6BR shooting 105-107gr bullets offers better ballistics all the way out to 1000 yards. Plus, for most people, the 6BR is just easier to shoot than a .308 Win. Recoil is less than half of the .308 Win cartridge. Both the .308 and 6BR chamberings offer good barrel life, but the 6BR uses 15-18 grains less powder, saving you money. On the other hand the .308 Win is the designated cartridge for F-TR and Palma shooting, so it may be a more versatile chambering for Long-Range competition. So which would we choose between the 6BR and the .308? Actually we think you should have both. The 6BR is a favorite cartridge out to 500 yards, and we like the .308 Win for F-TR. The .308 Win has shown outstanding accuracy, as displayed last week at the NRA F-class Nationals in Arizona.

Permalink Gunsmithing, Tech Tip No Comments »
October 5th, 2023

Switching Primer Types CAN Change Pressure and Velocity

Primer Wolf CCI Federal Muzzle velocity FPS reloading

We are often asked “Can I get more velocity by switching primer types?” The answer is “maybe”. The important thing to know is that changing primer types can alter your load’s performance in many ways — velocity average, velocity variance (ES/SD), accuracy, and pressure. Because there are so many variables involved you can’t really predict whether one primer type is going to be better or worse than another. This will depend on your cartridge, your powder, your barrel, and even the mechanics of your firing pin system.

BE SAFE: Be cautious when changing primer types. Glen Zediker recommended decreasing your load ONE FULL GRAIN when changing to a different primer type, one that you haven’t used before.

Interestingly, however, a shooter on another forum did a test with his .308 Win semi-auto. Using Hodgdon Varget powder and Sierra 155gr Palma MatchKing (item 2156) bullets, he found that Wolf Large Rifle primers gave slightly higher velocities than did CCI-BR2s. Interestingly, the amount of extra speed (provided by the Wolfs) increased as charge weight went up, though the middle value had the largest speed variance. The shooter observed: “The Wolf primers seemed to be obviously hotter and they had about the same or possibly better ES average.” See table:

Varget .308 load 45.5 grains 46.0 grains 46.5 grains
CCI BR2 Primers 2751 fps 2761 fps 2783 fps
Wolf LR Primers 2757 fps 2780 fps 2798 fps
Speed Delta 6 fps 19 fps 15 fps

You can’t extrapolate too much from the table above. This describes just one gun, one powder, and one bullet. Your Mileage May Vary (YMMV) as they say. However, this illustration does show that by substituting one component you may see significant changes. Provided it can be repeated in multiple chrono runs, an increase of 19 fps (with the 46.0 grain powder load) is meaningful. An extra 20 fps or so may yield a more optimal accuracy node or “sweet spot” that produces better groups. (Though faster is certainly NOT always better for accuracy — you have to test to find out.)

WARNING: When switching primers, you should exercise caution. More speed may be attractive, but you have to consider that the “speedier” primer choice may also produce more pressure. Therefore, you must carefully monitor pressure signs whenever changing ANY component in a load. In his books, the late Glen Zediker recommended decreasing your load ONE FULL GRAIN when changing to a different primer type, one that you haven’t used before.

Permalink Bullets, Brass, Ammo, Reloading, Tech Tip No Comments »
August 25th, 2023

Modern F-TR Rifle with Borden Action, Krieger Barrel, SEB Bipod

F-TR Rifle laminated stock X-Ring Borden Action SEB Joy-Pod
A carpet is used up front for smoother tracking with the Joy-Pod’s flat, ski-style feet. The arms of the Joy-Pod were painted to match the stock. The rear bag features low-drag material on the ears.

F-Class competition grows in popularity every year. Unlike F-Open, the F-TR (Target Rifle) class is limited to the .223 Remington (5.56×45) or .308 Winchester (7.62×51) chamberings. F-TR rifles also use bipods rather than a front rest. But these are no ordinary Harris-style bipods. Modern F-TR bipods have a wide footprint for added stability and many F-TR shooters favor SEB Co-Axial joystick bipods (aka “Joy-Pods”). Today we are featuring an F-TR rig that showcases the types of components, and accessories used by top F-TR competitors — including a coaxial bipod and Labradar Chronograph. If you’re considering getting started in the F-TR game, take a close look at this modern F-TR build from Forum member DM.Oakes.

F-TR Rifle laminated stock X-Ring Borden Action SEB Joy-Pod

Modern F-TR Rig with Borden Action, Krieger Barrel, and SEB Joy-Pod
This handsome .308 Win F-TR rig features a smooth-running Borden BRM action, 30-inch 1:10″-twist Krieger barrel, and an X-Ring Laminated Wood stock. Up front is a coaxial “Joy-Pod” joystick bipod. This is a state-of-the art, wide footprint bipod used by many competitors at the Worlds in Canada. The long joystick allows the “driver” to quickly adjust both elevation and windage in a smooth, continuous motion. The Joy-Pod can be adjusted so it will hold setting during the shot — you don’t have to “hard-hold” the joystick. Many shooters let the joystick slide through their fingers as the rifle moves back on recoil. With a little practice (and careful placement of the rear sand-bag), the tracking is excellent and you can slide the gun right back to point of aim after each shot.

Action: Borden BRM
Trigger: Blue-printed Jewell BR
Barrel: Krieger 30″ / 4-Groove / 1:10″ twist (.30 Cal)
Chamber: .308 Winchester with 0.170 Freebore
Stock: X-Ring Laminated F-Class
Scope: Nightforce 12-42x56mm Competition
Potential Name: Blue Thunder

F-TR Rifle laminated stock X-Ring Borden Action SEB Joy-Pod
This F-TR rifle is shown during load testing with a LabRadar chronograph.

» Full LabRadar Field Test/Review by Ray Gross

If you are considering purchasing a LabRadar Chronograph system, we strongly suggest you read the very thorough and informative LabRadar Review by Ray Gross, past Captain of the USA F-TR team. Ray notes: “It takes me about 3 minutes to set up [my LabRadar] at the range. Because there are no downrange screens, I do not have to hold up other shooters on the range like I would when setting up a traditional chronograph. The convenience alone will mean that I will use it more often than my old chronograph. Every time I take it out, I enjoy it a little bit more.”

Bart Sauter Ray Gross LabRadar Benchrest Review Chronograph Bench tripod

Permalink Competition, Gear Review No Comments »
June 15th, 2023

6.5 Creedmoor versus .308 Win — Cartridge Comparison Testing

.308 win winchester 6.5 creedmoor cartridge ballistics terminal performance comparison talks test video series

A new Vortex video series, Cartridge Talks Comparisons, looks at multiple variables along with ballistics gel tests to determine the comparative performance of popular cartridge types. Each Month, Cartridge Talks will examine and test two popular cartridges, comparing their head to head performance. In Episode 1, Vortex Nation™ hosts Mark Boardman and Ryan Muckenhirn pit the 6.5 Creedmoor and .308 Winchester cartridges against each other, examining projectile performance. Mark and Ryan then make conclusions about the applications best suited to each cartridge type.

Cartridge Comparison 14-minute video, Highlighting Ballistic Gel Testing

This first Cartridge Talks Episode pits the 6.5 Creedmoor against the .308 Winchester in a head-to-head, ballistics gel-induced bullet battle. Ballistics (drop/drift), penetration ability, terminal performance and other variables are tested with a variety of tools and tests. Viewers are invited to check out Episode 1, and suggest future cartridge battles in the comments section.

Here is the full 67-minute 6.5 Creedmoor vs. .308 Win Cartridge comparison video:

“With the myriad of cartridges available to the big game hunter, picking which chambering is best for you and your application can be a daunting task,” says Muckenhirn. “In Cartridges Talks, we put our biases on the shelf and put as much scientific process to this as possible. From ‘shootability’ and accessibility, to terminal performance as observed in ballistics gel, Cartridge Talks wades through the numbers and figures with you, loads you up with the pertinent information, and helps you select the ideal cartridge for your next hunt!”

Upcoming Cartridge Talks Shows include:

2023 July, Episode 2 — .308 Winchester vs. .30-06 Springfield

2023 August, Episode 3 — .270 Winchester vs. .30-06 Springfield

2023 September, Episode 4 — .308 Winchester vs. .300 Winchester Magnum

Permalink - Videos, Bullets, Brass, Ammo, Gear Review, Tech Tip No Comments »
May 9th, 2023

M1A Gunsmithing and Springfield M1A Match at Camp Perry

Springfield M1A gunsmith armorer's course AGI

Do you own a Springfield M1A (or wish you did)? Then you should watch this 5-minute video from the American Gunsmithing Institute (AGI). This video shows the basics of the operation of the popular M1A rifle, the civilian version of the military M14. In this video, gunsmith John Bush field-strips the M1A and shows how the bolt, op rod, and trigger group fits together and operates. This video contains excerpts from the M1A Rifle Armorer’s Course, AGI Course #1584. The full Armorer’s Course is available on DVD from www.AmericanGunsmith.com.

Watch Highlights of AGI M1A Rifle Armorer’s Course:

Springfield M1A rifle camp perry m14 .308 win AGI

Springfield M1A gunsmith armorer's course AGI

2023 CMP Springfield M1A Match at Camp Perry

The 16th annual Springfield Armory M1A Match will take place during the 2023 CMP National Rifle Games Matches. The CMP will host the event on Sunday, July 30, 2023, the same weekend as the Garand/Springfield/Vintage Military matches. Competitors of all experience levels are encouraged to bring their M1A rifles to Camp Perry and compete. CLICK HERE for Online REGISTRATION. The match is open to all individuals ages 12 and above. For more information contact the CMP at competitions@thecmp.org or call 419-635-2141 ext. 724 or 714.

Springfield M1A match high power rifle

The Springfield Armory M1A match began with one man’s idea and passion. Springfield Armory’s Mike Doy witnessed the waning of classic M1 Garand and M1A rifles from the competitive High Power firing lines. “I really wanted to get those M1A rifles out of safes and closets and back out onto the field. So 11 years ago, I promoted the idea of running an M1A-specific match at Camp Perry. That first year we had over 600 competitors and spectators.” Now the match offers some of the biggest pay-outs at Camp Perry. In recent years, Springfield Armory has donated over $25,000 worth of cash and prizes, including a $2,000 cash award to the overall winner.

Permalink Competition, Gear Review, Tech Tip No Comments »
December 25th, 2022

Sunday GunDay: X-Max for Xmas — Red Rifle from South Africa

X-Max Barnard Action V-block Welgemoed action Mostert carbon stock
Proud owner Dirk L. says: “This is my first build — never thought it would be a .308!”

Here’s a handsome F-TR rifle with a beautiful red stock that suits the holiday season. This ruby red beauty was a recent addition to the long-running Pride and Joy Rifle thread in our Shooters’ Forum. The rifle belongs to Forum member Dirk L. (aka “Pinkes”) who hails from South Africa. This is a .308 Win, with 30″ Bartlein barrel, and X-Max action. The stock is a custom composite with carbon fiber for strength and lightness. And yes this rifle shoots as good as it looks. Check out the impressive 5-shot groups below…

X-Max Barnard Action V-block Welgemoed action Mostert carbon stock

X-Max for Xmas — Impressive Metal-work
Along with that beautiful red stock, this F-TR rig has some very cool features, including a South African-crafted X-Max Action. The action designer Piet Welgemoed explains: “The X-Max action body is 17-4PH stainless steel pre-hardened to 44° Rockwell. Bolt and handle are one-piece stainless steel, nitrated to 55° Rockwell 0.2mm deep. Bolt is also fluted. Inside is the firing pin with washers (see below). The washer cuts the lock-time almost by half and also weighs less. The bolt-knob and bolt shroud are CNC aluminum. The action has very tight tolerances.” The complete action with +20 MOA rail and trigger weighs 1.475 kg (3.25 lbs).” Owner Dirk notes that the competition trigger, set at 3.0 ounces, is also Welgemoed’s design.

X-Max Barnard Action V-block Welgemoed action Mostert carbon stock

Wicked Accuracy with Bartlein Barrel, Varget, and 220gr SMKs
This gun has already proven to be a great shooter. Below are two FIVE-shot groups at 100 meters. The group on the left is in the low threes, with three of five shots essentially in one hole. Dirk loads Lapua .308 Palma brass and #2231 200gr Sierra Matchkings, seated 20 thousandths off the lands. The Varget powder and CCI primers drives the 200gr SMKs at 2620 fps.

X-Max Barnard Action V-block Welgemoed action Mostert carbon stock

Brass: Lapua .308 Win Palma (small primer) | Primers: CCI 450 | Powder: Varget
Bullet: New 200gr SMK #2231 | Seating: 0.020″ Off | Velocity: 2620fps

Composite Stock — One of Three by Renier Mostert
And what about that beautiful red stock? The rifle’s owner told us: “This was one of three similar stocks built as a test run by Renier Mostert, a professional composite stock builder and former benchrest shooter from Pretoria, South Africa. Renier was approached by three friends, who were all looking for decent, custom-built FTR composite stocks. There were a number of stocks available to them (mostly imported), but [those] were either made of wood or aluminum. The requirements for the composite stock build was very specific. Aluminum V-Blocks for the actions were required. The stocks had to be light enough to carry some beefy barrels and optics without compromising rigidity and still be within the F-TR weight limit. The three friends supplied Renier with an imported wooden stock as their shape of choice. Although the shape was quite straight-forward, Renier made a few dimensional changes to features which were not symmetrically correct on the sample, and then built a mold from it.”

X-Max Barnard Action V-block Welgemoed action Mostert carbon stock

Renier uses several methods to craft composite stocks for various disciplines: F-Class, benchrest, competition rimfire, hunting, and tactical. For this build he chose to build a shell constructed of a well-planned mix of woven fiberglass cloth and bi-directionally woven carbon fiber with aerospace quality epoxy resin to reduce weight in some areas and increase stiffness in other areas. He used a wet lay-up process where the two halves gets laid up and joined together while still wet to form a complete, continuous shell. The closed mold gets cured under pressure in an oven for several hours at very specific temperatures. After curing, the shell is filled with a high-tech mix of lightweight filler and epoxy resin. The composition of the mix varies in different areas of the stock to facilitate more strength or reduced weight where applicable.

X-Max Barnard Action V-block Welgemoed action Mostert carbon stock

After the initial build, the aluminum hardware was installed. An adjustable cheek piece, Anschutz rail, and adjustable recoil pad mechanism were installed. The stocks were inletted by Renier, while the final fitting and bedding procedures were left for each customer’s gunsmith to complete. The stocks were light enough for the rifles to comfortably be within the F-TR weight limit. A barrel tuner was mounted on one of the rifles, and the rifle still made the F-TR Class weight limit, 8.25 kg (including bipod). The bipod shown in photos in the SEB Joy-Pod.

X-Max Barnard Action V-block Welgemoed action Mostert carbon stock

Paint — Candy Apple Red over Metallic Silver Base
After final gunsmithing, the stocks were returned to Renier Mostert for custom painting. The rifle featured in this article was done in Candy-Apple Red paint from DNA Paints (an Australian company). To get the desired effect, a metallic silver base coat was used, enhanced with a modest amount of medium coarse glitter, followed with multiple layers of candy until the correct shade was achieved. A high-quality automotive clear coat was used to finish off the paintwork.

Permalink - Articles, Competition, Gear Review 1 Comment »
December 11th, 2022

Sunday Gunday: Get a Garand for Christmas This Year

CMP marksmanship program M1 Garand store order rifle vintage .30-06

We think every serious vintage rifle collector should acquire an M1 Garand at some point. If you ordered from the CMP this fall, perhaps you may find an historic M1 Garand under your Christmas tree this year. The CMP has, in the past couple of years, received over 90,000 Garands from overseas arsenals, so there are plenty to be had currently. This article explains how to order an M1 Garand from the CMP, and how to select the right grade for your needs and budget.

How to Order an M1 Garand from the CMP
To purchase an M1 Garand through the CMP, you must be an adult U.S. Citizen, and a member of an affiliated organization who has participated in a “Marksmanship Activity”. This basically means you need to join a gun club and participate in a clinic or match. Proof of club membership and citizenship is mandatory for all ages. However, the marksmanship requirement is waived for those over 60 years of age. Garands must be ordered by mail or through official CMP Auctions. CLICK HERE to Start Order.

Garand Turkish Turkey Philippines

CLICK HERE for Garand Ordering Information | CLICK HERE for Eligibility Requirements

CLICK HERE for Garand Grading Information

CMP Civilian Marksmanship Program M1 Garand Christmas Rifle
This handsome M1 Garand was built with a CMP barreled action fitted to an aftermarket figured Walnut stock. That’s not war-worn GI wood.”

Here are two videos that explain the procedure for ordering an M1 Garand from the CMP. Along with mail-order sales, the CMP has brick-and-mortar stores where M1 Garands can be inspected and purchased and then transferred via your FFL (in compliance with state law). The three CMP stores are located in Anniston, Alabama; Talladega, Alabama; and Port Clinton (Camp Perry), Ohio.

CMP marksmanship program M1 Garand store order rifle vintage .30-06

M1 Garand Barreled Actions and Aftermarket Barrels

CMP Civilian Marksmanship Program M1 Garand Christmas Rifle

Along with complete M1 Garand rifles, the CMP also offers barreled actions. This can save you money, and also makes sense if you are looking to create a rifle with high-grade wood, or you want to bed the action for improved accuracy. You can order an M1 Garand barreled action, as well as complete M1 Garand rifles, from the Civilian Marksmanship Program (CMP). The eligibility requirements and ordering process will be the same for a barreled action as for a complete rifle.

If you already have an M1 Garand, but need a new barrel, you can order a pre-chambered Criterion barrel in .30-06 Springfield. Criterion tell us: “This is a direct replacement barrel for the M1 Garand rifle, manufactured to Mil-spec print #6535448. It has the original G.I. contour and Parkerized finish. Receiver threads are timed, all milling cuts are made, and all M1 Garand barrels are hand-lapped.” NOTE: Each barrel is .010 short-chambered and should be headspaced by a qualified gunsmith. These Criterion .30-06 replacement barrels, priced at $295.00, are legal for use in Service Rifle and John C. Garand matches.

M1 Service and Maintenance
Shooting Sports USA (SSUSA) published an excellent article on Service and Maintenance of M1 Garand Rifles. This offers some smart tricks, such as using smoke from burning masking tape to darken the front sight post. There is also an older SSUSA article that covers basic cleaning and servicing and also explains how to upgrade the performance of your Garands. READ Article HERE.

M1 Garand maintenance procedures

As a resource for Garand owners, SSUSA recommends GarandGear.com: “[At] Garand Gear you’ll find USGI spec parts, tools, gauges, clips and a few Garand accessories. They also have some interesting freebies, most notably a direct analysis of M1 gas port pressures produced by different brands of commercial .30-06 ammunition, showing which ones exceed M2 Ball pressure, as well as the pressures produced by ammo manufactured specifically for the M1 Garand, such as Hornady’s M1 Garand Match and Federal’s American Eagle M1 Garand. Here you’ll also find free, downloadable and printable PDF copies of War Department M1 Garand maintenance manuals TM9-1275 and TM9-1005.”

m1 Garand Rifle Barrels CMP Criterion

M1 Garand Disassembly, Cleaning, and Lubrication

Permalink - Articles, Gear Review No Comments »
August 15th, 2022

Interesting Cartridge Comparisons from Brownells

Brownells video archive youtube channel AR15 6.5 Creedmoor Grendel SPC .308 Winchester 7.62x51

Brownells is a well-known retailer of guns, gun parts, tools, accessories, ammo, and pretty much everything gun related. Brownells has a very active video production department that releases new “how-to” and product information videos every week. These videos offer helpful advice on gun cleaning/maintenance, reloading, as well as selecting/assembling components for various kinds of rifles. There now over 1000 videos on the Brownells YouTube Channel, this really is a remarkable resource.

One of our favorite regular Brownells video features are the Quick Tip Cartridge Comparisons. Brownells tech staffers look at a pair of cartridge types and reveal the noteworthy differences. Here are three recent Cartridge Comparison videos from Brownells.

6.5 Creedmoor vs. .260 Remington

Brownells Gun Tech Caleb Savant compares and contrasts the 6.5 Creedmoor rifle cartridge with the older .260 Remington. Both cartridges are often loaded to nearly the same overall length (OAL), but with more of the bullet inside the neck for the .260 Rem. The .260 Remington is basically a .308 Winchester necked down to 6.5mm (.264″). The 6.5 Creedmoor has a shorter case, with a more modern 30-degree shoulder angle. With the same cartridge OAL, that can make it possible to load longer-ogive, higher-BC bullets. However, with a long-freebore chamber, the .260 Rem can certainly run any high-BC 6.5mm bullet made.

The .260 Remington can, theoretically, generate a bit more velocity at the muzzle because its longer case holds a bit more powder. However, with high-quality Lapua brass, in the real world, the 6.5 Creedmoor comes pretty darn close to .260 Rem performance with any given bullet weight. Moreover, the 6.5 Creedmoor is available with small primer pocket brass from Lapua. This brass may give a higher number of reloading cycles before case-head expansion becomes a problem. For the hunter, both choices are good, but the older .260 Rem may feed a bit better from a magazine, given the .260’s case taper and longer body. Overall, we favor the 6.5 Creedmoor for its versatility and efficiency, but the .260 Rem is a good cartridge too.

6.8 SPC vs. 6.5 Grendel

Brownells Gun Tech Caleb Savant compares two medium-caliber cartridges that can work in AR15-platform rifles: the 6.5 Grendel and the 6.8 SPC (aka 6.8mm Remington “Special Purpose Cartridge”). The 6.5 Grendel is typically loaded with a high-BC .264″ bullet, while the 6.8 SPC has a larger-diameter .277″ bullet. Both have the same 2.26″ OAL as the AR-15’s standard .223 Remington / 5.56 NATO round. The big difference is the 6.5 Grendel’s faster velocity and flatter trajectory. With the same bullet weight, Brownells says the 6.5 Grendel will be about 100 fps faster than the 6.8 SPC. Given a 100-yard zero, the 6.5 Grendel will drop about 8.5″ at 300 yards, while the 6.8 SPC will drop 10.5″ at the same range. The 6.5 Grendel is probably a better choice for long-range targets, at least when loaded with a higher-BC bullet. A big difference is brass. You can get superb Lapua brass for the 6.5 Grendel. Not so for the 6.8 SPC, which really has never developed into a widely popular accuracy round.

7.62×51 NATO vs. .308 Winchester (Subtle differences)

Brownells Technician Caleb Savant talks about the .308 Winchester and 7.62x51mm NATO. Most shooters know that both rounds have the same external dimensions. In fact, the military 7.62×51 was developed from the civilian .308 Winchester. So… can they be used interchangeably? The 7.62×51 cartridge normally can be fired from any rifle chambered in .308 Winchester because the 7.62 is spec’d for a lower pressure than SAAMI max in the .308 Win. However, we have encountered some British and Austrian 7.62×51 NATO milsurp ammo that was VERY hot — more than a typical commercial .308 Win Load. Accordingly you should always be careful when shooting new 7.62×51 ammo in your rifles. Likewise you should be careful about shooting higher-pressure .308 Win in some 7.62 NATO rifles. The 7.62×51 NATO chamber is slightly longer, and the cartridge’s case is typically a bit thicker, so it will “flow” and expand into the extra space. NOTE: Some newer rifles with 7.62×51 NATO chambers ARE made to handle .308 Win ammo. Check the owner’s manual or contact your rifle’s manufacturer to find out for sure.

.44 Magnum vs. .45 Long Colt — Great Wheelgun Cartridges

Brownells Gun Tech Steve Ostrem does a quick compare-and-contrast of the .44 Magnum and .45 Long Colt — two of the most popular revolver cartriges. The .45 LC debuted in the 1870s, when the steel used in revolvers was much weaker than modern steel, so it’s typically loaded as a low-pressure cartridge. The .44 Magnum was developed in the 1950s specifically for hunting, and stronger modern gun steels meant revolvers could be built to handle its much greater pressures. Full-power commercial .44 Magnum ammunition tends to be easier to find. The .45 Colt you find at the gun store is loaded mildly so folks don’t blow up their vintage revolvers! BOTH cartridges are great for handloading because they have straight-wall cases and can handle a wide variety of powders and bullet weights. Dies, brass, and bullets are readily available for both. If you don’t handload but want a hunting revolver, .44 Magnum is the better choice, as there’s more FULL-power factory ammo available.

Permalink - Videos, Bullets, Brass, Ammo, Gear Review 1 Comment »
August 3rd, 2022

Changing Primer Type CAN Alter Pressure and Velocity

Primer Wolf CCI Federal Muzzle velocity FPS reloading

We are often asked “Can I get more velocity by switching primer types?” The answer is “maybe”. The important thing to know is that changing primer types can alter your load’s performance in many ways — velocity average, velocity variance (ES/SD), accuracy, and pressure. Because there are so many variables involved you can’t really predict whether one primer type is going to be better or worse than another. This will depend on your cartridge, your powder, your barrel, and even the mechanics of your firing pin system.

BE SAFE: Be cautious when changing primer types. Glen Zediker recommended decreasing your load ONE FULL GRAIN when changing to a different primer type, one that you haven’t used before.

Interestingly, however, a shooter on another forum did a test with his .308 Win semi-auto. Using Hodgdon Varget powder and Sierra 155gr Palma MatchKing (item 2156) bullets, he found that Wolf Large Rifle primers gave slightly higher velocities than did CCI-BR2s. Interestingly, the amount of extra speed (provided by the Wolfs) increased as charge weight went up, though the middle value had the largest speed variance. The shooter observed: “The Wolf primers seemed to be obviously hotter and they had about the same or possibly better ES average.” See table:

Varget .308 load 45.5 grains 46.0 grains 46.5 grains
CCI BR2 Primers 2751 fps 2761 fps 2783 fps
Wolf LR Primers 2757 fps 2780 fps 2798 fps
Speed Delta 6 fps 19 fps 15 fps

You can’t extrapolate too much from the table above. This describes just one gun, one powder, and one bullet. Your Mileage May Vary (YMMV) as they say. However, this illustration does show that by substituting one component you may see significant changes. Provided it can be repeated in multiple chrono runs, an increase of 19 fps (with the 46.0 grain powder load) is meaningful. An extra 20 fps or so may yield a more optimal accuracy node or “sweet spot” that produces better groups. (Though faster is certainly NOT always better for accuracy — you have to test to find out.)

WARNING: When switching primers, you should exercise caution. More speed may be attractive, but you have to consider that the “speedier” primer choice may also produce more pressure. Therefore, you must carefully monitor pressure signs whenever changing ANY component in a load. In his books, the late Glen Zediker recommended decreasing your load ONE FULL GRAIN when changing to a different primer type, one that you haven’t used before.

Permalink - Articles, Bullets, Brass, Ammo, Reloading, Tech Tip 1 Comment »
July 26th, 2022

Comprehensive Print Guide to Factory Ammunition

Ammunition Ammo Factory commerical hunting load data ballistics hunt Bob Forker

Do you plan to use factory ammo in your hunting rifles? Perhaps you buy bulk centerfire ammo for your AR15s or varmint rifles. And you’ll certainly consider using factory ammo in all your rimfire guns. Then this book can definitely benefit you.

If you ever shoot factory ammo, you should consider getting Ammo & Ballistics 6. This resource lists over 2,600 different loads for 200+ cartridge types from .17 Mach 2 up to .700 Nitro Express, including the most popular centerfire and rimfire cartridges (both rifle and handgun). In this updated-for-2020 Sixth Edition, there are over 3,000 tables covering virtually every caliber and every load for all commercially-loaded hunting ammunition sold in the USA. Tables include velocity, energy, wind drift, bullet drop, and ballistic coefficients up to 1,000 yards.

Ammunition Ammo Factory commerical hunting load data ballistics hunt Bob Forker

Ammo & Ballistics 6 helps you select ammo for a hunt — quickly compare the velocity and knock-down power of various commercial ammo. This book can also help you choose a caliber/chambering for your next hunting rig.

Verified Book Purchaser Reviews
“Outstanding reference guide for shooters and ballistic enthusiasts alike. Has data on velocity, energy delivered, Taylor KO index, windage and elevation on numerous loadings for hundreds of [cartridge types]. Each cartridge has all dimensions labeled (i.e rim, case length, neck, etc.), and has an informative description of the cartridges history/relevance.” — S. Step, 2017

“Great heaps of data! This volume has pages and pages of new data for .22 LR like the hot Velocitor, and also on the .22 WMR from 30 grains up into the 50s. Most importantly there is lots of range data, drop, windage, kinetic energy, etc. — Terrific reference guide….” — E. Svanoe

Ammo & Ballistics 6 contains data and illustrations on virtually every sporting cartridge sold in the USA. This latest edition covers 200-plus cartridge types from .17 Mach 2 up to .700 Nitro Express.

Permalink Bullets, Brass, Ammo, Gear Review, Hunting/Varminting No Comments »
June 5th, 2022

Sunday Gunday: Multi-Tasking .308 Tubegun in Eliseo Chassis

eliseo competition machine tubegun .308 Win Lafevers palma bag rider steel tactical

This article features an impressive .308 Winchester tubegun, crafted with an Eliseo (Competition Machine) RTS chassis, Borden action, and 30″ Krieger medium Palma Contour barrel. Owner Mark LaFevers chambered and fitted the barrel and assembled the rifle himself. What’s more, Mark even crafted his own muzzle brake, front/rear bag-riders, and his own, innovative “big-foot” bipod! Mark’s Do-It-Yourself (DIY) tubegun has proven as accurate as it is multi-faceted. Optimized to shoot the 155-grain-class match projectiles, this gun is a tack-driver. This Editor has witnessed the gun repeatedly put 3-round groups into one ragged hole at 100 yards. At 600 yards, the gun has held under 1″ of vertical in competition.

When it comes to versatility, it’s hard to beat a tubegun chambered in .308 Winchester. This rifle system can be used in High Power (Palma) competition, F-TR matches, Long Range Steel Matches, and Tactical Competitions. With the addition of a front sled, a modern tubegun can even be competitive in 600-yard benchrest matches, as demonstrated by Jerry Tierney, who, some years back, won the NBRSA 600-yard Nationals with an Eliseo (Competition Machine) tubegun.

Do-It-All Multi-Discipline .308 Win Tubegun for F-TR, Benchrest, Varmint Matches, Palma, and Tactical Competitions

by Mark LaFevers

The Concept — a ‘Do-It-All .308 Win’
This project began with a wish list developed after shooting in a precision tactical match in 2009. From that experience I knew I wanted a magazine-fed precision bolt gun sporting a high-quality, variable-power scope. I wanted a rifle that could be competitive in a broad range of gun games including tac comps and long-range prone events. If the gun could also double as a medium-range benchrest rig, that would satisfy the needs of the monthly club matches I shoot — a varmint steel silhouette match (shot from the bench), and an F-Class style prone event. I also wanted a gun that could shoot Palma matches someday (when I get around to learning to shoot with iron sights).

Because I like to build things, I’m always looking for projects that offer opportunities to customize and innovate to suit my needs. And because I’m interested in trying different shooting disciplines, I hoped to craft a rifle that could be reconfigured fairly easily to fit various needs. To maximize the gun’s potential, I chose to use only the highest-quality components for every aspect of this project. I planned on building as much of this rifle as I possibly could myself — and that would include chambering and fitting a barrel for the first time. Having much to learn, I would be relying heavily on the expert advice and goodwill of others for the gun’s success.

The Do-It-Yourself Approach — The Appeal of Building Your Own Rifle
Not everyone understands the DIY (do-it-yourself) approach to life. Why would anyone try to smith his own rifle, when he could have it done by competent professionals? There is the imagined prospect of cost savings. However, a home gunsmith may find that, at least initially, it costs more money to do it yourself when all the costs of tooling etc. are calculated. But doing it yourself is not just about saving money. There is a special satisfaction derived from building something with your own hands. For me the relationship between practiced hands, tools, materials, and knowledge of craft is important. The DIY approach surely means different things to different people. For me it’s about the quest for improvement, and an appreciation of the importance of craftmanship in history, and trying to do my part.

Whatever our craft, the fit and function of the things we care about ultimately define us. In this project I felt a responsibility to uphold certain standards. I also was motivated by the desire to give ‘homage’ to my distant relative Daniel M. LeFever, a gun-maker who left his mark on the firearms industry in the 1870s. “Uncle Dan” LeFever crafted high-grade double guns that rivaled the finest European doubles.*

Choosing Components for the .308 Win Tubegun
Looking over the range of suitable equipment, it did not take long to come across Gary Eliseo’s Competition Machine tubegun chassis kit. Initially intrigued by the beauty of the machine work in this aluminum stock, the more I looked the better this platform seemed. Gary’s RTS kit for Remington 700 and Rem clones accepts the proven AICS magazines and offers great stock adjustment flexibility. For more on that subject read German Salazar’s excellent article on Configuring the Eliseo Tubegun Stock.

.308 Eliseo Tubegun

When I learned that Jim Borden, BordenRifles.com, was building an action designed specifically for the Eliseo tubegun stock, the decision to go this route was made even easier. I had previously had the opportunity to admire close up the Borden action used by our top Club benchrest record holder, and I knew I couldn’t go wrong there. In selecting a trigger group, I knew I wanted a fully adjustable two-stage trigger that could be set for different pull weights for various shooting disciplines. At first glance Jewell seemed to be the obvious choices, but I asked if there were any products that might be better than the Jewell for my purposes. It was suggested that an American-made trigger by CG Jackson might do the trick, so I talked with Tom Myers of X-Treme Shooting Products. Tom’s company offered a fully-adjustable, 2-stage Mod 22 Tactical trigger that fits Remington 700 actions and their clones. It is offered with a fixed or moveable shoe, with or without a safety. I chose the fixed trigger shoe with no safety.

Eliseo Tubegun

Choosing a Scope
Given my prior positive experiences with Nightforce products, a Nightforce scope was my first choice in optics. But I needed to select between the NXS (side-focus) and BR (front focus) models, and chose a magnification range. Because I wanted to play a variety of gun games from Tactical to Benchrest, it seemed to me that the NXS, with its faster side focus parallax adjustment, would be the more versatile choice. I went with the 12-42x56mm version so that I had plenty of magnification on tap for long-range precision work. I can still dial it back to 12 power for a wider field of view, as needed.

LaFevers .308
Mark bench-testing the gun during Load Development. The front rest is the superb SEB Neo Co-Axial.

Caliber Choice and Load Development

Choice of Caliber — .308 Win Offers Accuracy, Versatility, Long Barrel Life
Rather than agonize over the many caliber choices, I chose to step back and consider what I thought, in my experience, made winning shooters. Was it the caliber they were shooting or their training, skill and intelligence, that made them winners? While it is true that various calibers do have their specific merits, it is also true that an individual with five times as much training as you is likely to beat you with whatever caliber he or she is using. Case in point being the tactical match that got me started on this project, won by a young Marine shooting a .308 Win. While many other competitors had rifles with “faster, flatter, superior ballistics”, the Marine topped the field through his superior training, natural ability, and the keen edge of youth. With the right trigger puller, .308 Win was clearly still good enough to win this kind of match.

Among the arguments in favor of the .308 Win caliber for this project were:

  • I had positive previous experience with the .308 and was already set up to reload for it.
  • Very wide selection of performance-proven bullets.
  • Some popular disciplines, such as F-TR and International Fullbore, specify .308 Win (7.62×51) as one of the “permitted” chamberings.
  • Top shooters could provide guidance on .308 load development, and effective shooting techniques.
  • .308 Win offers long barrel life.

Weighing against the .308 Win were higher component costs and heavier recoil compared to many popular, smaller, mid-distance calibers, such as the 6mmBR, 6 Dasher, 6XC, and 6.5×47 Lapua.

Selecting the Optimal Barrel Configuration for my Bullet Selection
One way of narrowing the field of .308 bullet options is to choose a specific bullet that has performed well for winning shooters, and design the gun around the bullet. The weight of the bullet and its preference for a specific seating depth dictate the twist rate of the barrel and the depth of the chamber, which is also dependent upon whether you choose to single feed or magazine feed. Because I have had very positive experiences with Berger bullets, and becasue Berger Ballistician Bryan Litz was very positive about Berger’s 155.5gr Palma bullet, that was my starting bullet choice for this gun. Because Bryan had great 1000-yard success with a 1:13 twist barrel with the 155.5 bullet, but thought he might go with a 1:12 twist next time, I felt it would be interesting to try a 1:12.5″ twist. Krieger Barrels was able to privde this specific twist rate, and we hoped Krieger’s 5R rifling with a 30″ length would yield a fast barrel. Some extra velocity would help offset the velocity loss I might suffer by being limited to a mag-length COAL. (If I could load longer than mag length I could stuff in more powder and get more velocity.) The Krieger 5R proved a very good choice. From the start the barrel has cleaned up easily, it has delivered awesome accuracy, and it holds very tight elevation at long range. I’ve also been able to achieve very low ES/SD with this Krieger.

Gun Set-Up and Initial Testing
The first break-in of the rifle was done at 100 yards on home turf at the Ojai Valley Gun Club in California. Your Editor and I put 40 rounds through it using Krieger’s recommended break-in procedure. Our impression was that in less than 10 rounds the barrel was ready for competition. I shot the second 10 rounds looking at the performance of the variable muzzle brake I had built. Firing initially with only the one built-in baffle in place, a tremendous amount of gas was still blowing forward, made visually more pronounced by the frosty 29° air. Maximum recoil reduction was achieved adding the front baffle spool, so this is how the brake will be used. On disassembly after firing the forward faces of the baffle spool show descending amounts of powder residue from the gas entry to exit end, with almost no residue at the final baffle wall, showing most of the gas has exited to the side by that point. Attention to precision alignment shows the brake having no adverse effect on accuracy, as the last 20 rounds seated to various depths yielded a couple three-shot, one-hole groups at 100. At the end of the session I was pleased to find that the Krieger barrel cleaned extremely easily. Two wet patches cleared the powder residue and just a little copper showed up at the muzzle end by visual inspection.

Muzzle Brake with Baffle

The Jim Borden action has a really nice feel when single round loading, and good consistency feeding from the magazine with an authoritative hand. The ejector is very aggressive and will pitch the brass off the bench if it isn’t blocked from escaping. This action cycles very smoothly, and the beautiful workmanship shows even with the tubegun chassis mostly surrounding it.

Eliseo Tubegun
Mark crafted two front sleds for the gun, one from metal, another from wood (which worked a bit better). Mark notes: “With the wood bag-rider in place the gun became quite stable, and you didn’t notice the high center of gravity so much.” Mark also made his own rear Bag-Rider.

Tubegun Wins First Fun Match
Shortly after breaking in the barrel, I took the gun down to a nearby range to compete in an informal 300- and 400-yard paper competition. I thought it would be fun to test loads while shooting in a club-level fun match. I was getting the best grouping at 44.5 grains of Varget, hotter loads were not doing so well, leading me to believe I needed to work up loads from 44.0 to 44.5 by tenths to find the sweet spot. In the 10-competitor match I squeaked out a win by 1 point. Still, a win is a win!

Load Development

I took the rifle up to the Ojai range at daybreak to run some load variations at 600 yards in still 26° air. I printed targets (sourced from AccurateShooter.com’s FREE Target Page) that had a 1″ red dot within a 5″ grid box. The dot made an excellent aim point at 600 yards. Here the capabilities of the Nightforce 12-42 NXS optic really became apparent. In the exceptionally clear, early morning conditions, I could see the dot AND the bullet holes — all at 600 yards downrange! I had set up my 72-power Meade spotting scope but didn’t use it as the Nightforce scope had more clarity and sharpness. There was no need to go downrange to check the targets, as bullet holes were clearly visible on the targets. This is great because I can make better use of the narrow window of perfect air in the morning, before the sun stirs thermals and mirage.

In this rifle, the Berger 155.5gr Fullbore bullet likes to be seated .010″ off what I’m calling “Max Jam”, using a Hornady OAL length gauge pressing the bullet softly into the lands, so the bullet just barely sticks there when the tool is removed. [Editor’s Note: At his optimal seating depth, Mark’s bullets are still in the lands, just .010″ shy of the max length he can load them without set-back.] The rounds are loaded to 2.850″ OAL to magazine feed. Even though I cut a “no-turn” chamber, I do lightly turn the outside of the case necks to uniform them. I like to look at bullet bearing surface length variations, using a Sinclair comparator body and two .30-cal inserts, one on the nose and the other on the tail of the bullet. With very uniform bullets like the Bergers this method is really only attempting to spot that random outlier bullet that varies in length enough to separate from the group. This is no knock on Berger, just a nod to the challenges of maintaining incredibly tight manufacturing tolerances.

Eliseo Tubegun

Today’s five shot groups of Varget, jumping by tenths of a grain from 44.0 to 44.5 grains, showed the best grouping to be at 44.1 grains. The hotter loads were breaking the 2900 fps level, but the groups were not as tight as they were at the lower end. At 44.1 grains of Varget the five-shot group had a vertical dispersion of 1.9″ and a horizontal dispersion of 1.25″ at 600 yards, making that a keeper load.

Competition Load Selection and Performance
With a NBRSA 600-yard match fast approaching, I realized that with all the focus on testing I didn’t have enough Lapua brass to shoot the entire match. My solution was to fall back on once-fired Hornady Match brass, with which I have also had excellent luck. So, the day before the NBRSA match, I loaded up the best combinations of the Berger 155.5s with Hornady/Varget, Lapua/Varget, and Hornady/8208 for a final trial, and headed out to a 1000-yard range that’s a two-hour drive from home. Expecting to see the faster IMR 8208 edge out the Varget at this range, I was surprised to see the performance basically identical. With this last minute perspective I decided to shoot the six target NBRSA match using Berger/Hornady/Varget for the first three matches, then Berger/Hornady/8208 for the last three matches when the extra speed might help in a rising afternoon wind.

Match Results
Best results were in Match 1 using 44.0 grains of Varget to push the Berger 155.5 from the Hornady Match brass. Fortunately four bullets flew to a 1.44” group in the blue, unfortunately it was a five-shot match and one bullet flew high left. Excellent promise also showed in Match 6 with the IMR 8208 XBR powder yielding less than an inch of vertical at 600 yards. The lesson I learned from the event was that operator consistency was a much bigger factor than the technical limitations of the hardware or the ammunition. The gun can definitely shoot better than I can hold. I had the opportunity to shoot off a beautiful SEB NEO front rest in this competition. Although I am not a fan yet of joystick controls, this rest performed flawlessly and definitely had a positive effect on performance.

Eliseo Tubegun Target

My Overall Impressions of the Project
For use as a benchrest rig, the tubegun provides an interesting challenge, because the pistol grip seems to make the gun much more sensitive to steering errors than a typical low-profile benchrest stock. You have to focus on consistency of grip. A light grip and firm cheek weld combination seems to work well at the bench, but the gun also responds well to a very firm grip and heavy shoulder pressure when fired in the prone position. Building an Eliseo tubegun is a great project and the finished product is a very versatile, fun-to-shoot gun! To encourage others with similar interests, let me just say that the products and components used in this project all get my five-star endorsement, without exception or hesitation.

The biggest challenge with this rifle lies in my own skill development — particularly for tactical matches. If you only have experience with known-distance shooting matches, you’ll need a whole new set of skills to be successful in unknown-distance (UKD) tactical competitions. These UKD matches require high levels of shooting intelligence and training. However, now that I have a rifle that instills confidence, I can work to improve my skills. Overall, I am very happy with the results of this project — the gun has certainly lived up to my expectations. It is rugged, accurate and very adept at “multi-tasking.”

DIY Machining — Chambering My First Barrel

One of my main objectives with this project was to do my own barrel chamber reaming and fit-up work. I had been studying and working from John Hinnants’s excellent book on Precision Rifle Barrel Making, building tools and working with the concepts, and felt myself to be ready to tackle the machining aspects of the project. Having local ace gunsmith Mac Tilton to talk to really helped me understand what would be needed. Greg Tannel’s excellent GreTan DVDs on how to set up a high pressure thru-the-barrel reamer flushing system and align the lathe tailstock properly for precision chamber reaming were invaluable. Greg’s off-the-shelf, hardware-store flow control layout makes the flushing system easy to regulate for other purposes as well. I built the reamer holder Greg describes in his DVD, and it too works well.

I began at everyone’s recommended starting point, which was to recheck the level of my lathe, a Jet 1340 gearhead belt-driven model. To accomplish this I used a precision 12” machinist level from Grizzly Tools. I can’t say the tool was easy to use because the leveling process is tedious as hell, but the level worked very well.

Manson .308 Reamer

Dave Manson Shares His Reamer Knowledge
In researching which reamer maker to use to create the custom reamer for the Berger 155.5 fullbore bullet, which seems to like about .015″ jump to the lands, I was drawn by name recognition to Dave Manson’s products. In my years of thumbing through Brownells catalogs I was impressed with the thought Dave had put into the development of so many of his tools. During several phone conversations, I greatly benefited from Dave’s experience with chamber tolerances, cutting fluids and reamer modifications specific to thru-the-barrel flushing. To help spec the reamer, I sent Dave a couple dummy rounds built to magazine length so he could make a custom reamer to yield .015” jump and a no-turn neck. In no time I was using the Dave Manson reamer to practice with the flushing system on pieces cut from a take-off barrel, then checking dimensions using Cerrosafe castings. The dimensions were exactly as we had discussed, and I do mean EXACTLY! From the way Dave’s reamer worked in practice chambers, I knew this tool would produce a superior chamber.

Grizzly Tailstock DRO

Chambering Process with Tailstock DRO
For this project I set up a lathe tailstock digital readout from Grizzly, part # T10118, to help keep track of boring depth. Unlike relying on counting revolutions of the tailstock handwheel, with the DRO you are looking at the total travel measurement on a digital display, which is equally precise to the alternate dial indicator method. The chamber was cut in the stainless Krieger barrel at 60 RPM, using Mobilmet 744 heavy cutting oil diluted with mineral spirits, flushing chips from the reamer flutes at 100 PSI. For the last few thousandths of cut, lathe power was shut off and the cut completed by turning the reamer holder by hand while in-feeding with the lathe tailstock handwheel for precise depth and chamber dimension control.

To shorten this article up a bit and keep it on point for those interested in the rifle and not the process, let me just mention that details of some of the additional parts I made can be seen at my website: LaFeversFabricating.wordpress.com. Those parts include a muzzle brake of my design, my fast attach bipod design, a drop-leg level, wood grip, and wooden as well as metal front and rear bag riders for benchrest work.

Acknowledgements
For their participation and patience in supporting this project, and their tolerance of my myriad questions about parts and processes, I would like to thank, in alphabetical order:

Berger Bullets — Bergerbullets.com — Berger 155.5gr Fullbore Match bullets.
Jim Borden — BordenRifles.com — Stainless Rem. Clone action for Eliseo tubegun.
Gary Eliseo — CompetitionShootingStuff.com — RTS tubegun stock kit.
Grizzly Industrial — Grizzly.com
Krieger Barrels — KriegerBarrels.com — 30″ Medium Palma, 1:12.5″ twist 5R rifling, tight bore.
Dave Manson — MansonReamers.com — Custom .308 Win finish reamer for Berger 155.5 fullbore bullet.
Tom Myers — X-tremeShooting XTSP — CG Jackson Mod 22 Tactical 2-Stage Trigger.
Nightforce Optics — NightforceOptics.com — 12-42×56 NXS Scope with NP-R1 ranging reticle.
Greg Tannel — GreTanRifles.com — Lathe set-up and chambering DVDs.


*According to Chuck Hawks: “‘Uncle’ Dan Lefever was one of the greatest gun designers of his, or any, time. He founded several companies….The largest and best known of these, Lefever Arms Co., was eventually acquired by the Ithaca Gun Company around the time of the First World War. In the hey day of the classic American double there were guns galore and many different grades and price points, from plain field grade guns to masterpieces rivaling the best European guns. The Lefever Arms guns, for example, won medals at an International Arms Exhibition for ‘Best American’ and ‘World’s Best’ shotgun.”

Permalink - Articles, - Videos, Gear Review, Gunsmithing No Comments »