Thompson/Center Arms has a new rebate program running October 1, 2018 to December 31, 2018. Get $50 back with the purchase of a T/C Compass rifle or $25 back with the purchase of a T/C Impact muzzleloader. You can also get $50 rebate on T/CR22 rimfire rifles, as part of the Rimfire Redefined promo which began in August, 2018.
The T/C Compass is a basic, no-frills hunting rifle. T/C Compass owners say this rifle offers excellent “bang for the buck”, with decent accuracy (approaching 1 MOA). American Rifleman has done a very thorough review of the T/C Compass that’s worth reading. That review shows details of the action and the three-lug bolt. The tester liked the Compass trigger, writing: “It’s as good a factory trigger as I’ve encountered.” The test rifle, chambered in .30-06 Springfield, averaged 1.23″ 5-shot groups with three types of factory hunting ammo.
To participate in the “Hunt for Savings” rebate program, customers must complete and submit the online rebate form at Smithandwessonrebates.com. Deadline for rebate submission is January 31, 2019.
Rebates will be delivered as follows:
$50 USD Smith & Wesson prepaid MasterCard on any new T/C Compass bolt-action rifle.
$50 USD Smith & Wesson prepaid MasterCard on any qualifying new T/CR22 rifle.
$25 USD Smith & Wesson prepaid MasterCard on any new T/C IMPACT! Muzzleloader.
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Do you need to pull bullets that have been seated in a case? You can use lever-actuated, collet-type pullers, or inertial hammer-style pullers, but there is a faster solution. The Grip-N-Pull bullet puller is a precision-machined hand clamp that works for multiple calibers. A single Grip-N-Pull can replace several other tools, while being faster to use. With larger-diameter bullets loaded with light-to-moderate neck tension, it works well. The bullets come out pretty easily, with no scuff marks or dents. For smaller-diameter, .204 to .243 caliber bullets, it may be hard to grip the bullet easily, or you may end up with some jacket damage. And we wouldn’t use this for factory-crimped cartridges.
Introduction to Grip-N-Pull — How It Works:
How to Use the Grip-N-Pull
Put your loaded case in the shell-holder on a reloading press. Raise the ram so the bullet is exposed at the top of the press. Then select the correct, caliber-specific slot in the Grip-N–Pull, clasp the bullet firmly, then lower the ram. The bullet withdraws from the case-neck, retained in the tool. Fast and simple. If there isn’t much neck tension (or a crimp), the bullet should come out undamaged.
Not So Great for Small-Diameter Bullets
Watch this video — the tester says the Grip-N-Pull works well with larger-diameter bullets, but there can be slippage with smaller-diameter projectiles, or those with short bearing surfaces. NOTE: When there is a lot of neck tension, you have to grip extremely hard which can cause your hand to hurt after a while. And the bullets can get marred.
This video explains some of the shortcomings of the Grip-N-Pull.
Four Grip-N-Pull Models Available Grip-N-Pull bullet pullers can be used for multiple calibers. For example, the Standard Rifle Grip-N-Pull pulls bullets for these calibers: .17, .20, .22, .24, .25, .26, .27, .28, and .30. The Large Rifle model works with 8mm, .338, .375, .416 and .458. There is a third model for pistol cartridges, and a fourth “Mil-Spec” unit that does 5.56, 7.62, .338 and .50 BMG. Grip-N-Pull bullet pullers are made of 1/4″ heavy-duty #30 stainless steel and are backed by a lifetime warranty.
Speed and Efficiency of Grip-N-Pull
The Grip-N-Pull’s creators claim this hand clamp cuts bullet pulling time in half. For a speed comparison between Grip-N-Pull and a hammer-style (inertial) bullet puller, watch this Extreme Outer Limits video. Bob and Chris Beck do a head-to-head comparison between the Grip-N-Pull and an inertia puller. It’s no contest — the Grip-N-Pull is way faster, and the powder stays in the case.
Pull Comparison — Grip-N-Pull Vs. Hammer-Style Inertial Puller
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Jerod’s Tactical Trio
Many guys are lucky to have just one accurate tactical rifle fitted with a custom barrel and high-end optics. Well forum member Jerod (aka Stinnett1981) has three!
Jerod calls his tactical trio the “Three Amigos”. All are built with Manners Composite stocks and Bartlein barrels. But there are three different chamberings. In order below (from top to bottom) are: .308 Win (Bartlein 5R, 1:10″ twist); .223 Rem (Bartlein 5R, 1:8″ twist);,and 6.5×47 Lapua (Bartlein 5R 1:8.5″ twist). Read on for a full description of each build.
The tan rifle is Jerod’s .308 Winchester. It has a Manners T4A stock, trued Rem 700 SA, Badger M5 DBM, and Bartlein 5R 10-twist HV contour finished at 23″. The optic is a Bushnell XRS 4.5-30X50mm FFP with G2 reticle scope.
The Green rifle is a .223 Remington. This has a Manners T4 stock, trued Rem 700 SA, Badger M5 DBM, and Bartlein 5R 8-twist HV contour finished at 23″. On top is a Nightforce NXS F1 3.5-15X50mm FFP with MLR 2.0 reticle scope. Jerod says: “This scope and reticle are awesome.”
The Black rifle is chambered for the 6.5-47 Lapua. Components are: Manners T4A stock, Stiller TAC 30, Badger M5 DBM, Bartlein 5R 8.5-twist bull barrel (1″ at muzzle) finished at 26″. The scope is a Nightforce NXS 8-32X56mm with NP2DD reticle.
What Comes Next — A Rimfire Maybe?
While Jarod’s Three Amigos make up a very impressive tactical troika, we’d like to see one more rifle added to the mix — a .22 LR rimfire rig, set up with a similar stock. That would be perfect for low-cost cross-training, or competition in Rimfire Tactical matches. Jerod could build the “fourth Amigo” using a rimfire action. Here is just such a rifle, built by Brian of GA Precision with a modified Rem 40X action in a Manners T4A stock (matching Jerod’s centerfire stocks). Pretty cool eh?
Could This Be the Fourth Amigo? 40X Rimfire in Manners Stock
Brian, a gunsmith at GA Precision, built this rimfire rig with GAP colleague Anthony Soukup.
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When your cases become hard to extract, or you feel a stiff bolt lift when removing a cartridge, it’s probably time to full-length size your cases, and “bump” the shoulder back. With a hunting load, shoulder bumping may only be required every 4-5 loading cycles. Short-range benchrest shooters, running higher pressures, typically full-length size every load cycle, bumping the shoulder .001-.002″. High Power shooters with gas guns generally full-length size every time, and may need to bump the shoulders .003″ or more to ensure reliable feeding and extraction.
Use Shims for Precise Control of Shoulder Bump
Some shooters like to set the “default” position for their full-length die to have an “ample” .003″ or .004″ shoulder bump. When they need less bump, a simple way to reduce the amount of shoulder movement is to use precision shims in .001″ (one-thousandth) increments.
Here are reports from Forum members who use the shims:
“Great product. I have my die lock ring(s) adjusted for the shortest headspace length on my multiple chambers 6BRs and 6PPCs. When needing a longer headspace, I just refer to my notes and add the appropriate shim under the lock ring. Keep it simple.” — F.D. Shuster
Mats Johansson writes: “I’ve been using [shims] since Skip Otto (of BR fame) came out with them. I set up my dies with the .006″ shim, giving me the option of bumping the shoulder a bit more when the brass gets old and hardens while still having room to adjust up for zero headspace, should I have missed the original setup by a thou or two. Hunting rounds can easily be bumped an extra .002-.003″ for positive, no-crush feeding. Being a safety-oriented cheapskate, I couldn’t live without them — they let me reload my cases a gazillion times without dangerous web-stretching. Shims are a must-have, as simple as that.” — Mats Johansson
Sinclair Int’l offers a seven-piece set of Sizing Die Shims that let you adjust the height of your die (and thereby the amount of bump and sizing) in precise .001″ increments. Sinclair explains: “Some handloaders will set their die up to achieve maximum sizing and then progressively use Sinclair Die Shims between the lock ring and the press head to move the die away from the shellholder. Doing this allows you to leave the lock ring in the same position. These shims are usually available in increments of .001″ and work very well.”
Seven Shims from .003″ to .010″
Sinclair’s Die Shim Kit (item 22400) includes seven shims in thicknesses of .003, .004, .005, .006, .007, .008, and .010. For ease of use, shim thickness is indicated by the number of notches cut in the outer edge of each shim. Even without looking you can “count” the notches by feel. Normally priced at $11.99, this shim kit is on sale now for $10.99.
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At the request of our readers, we provide select “Deals of the Week”. Every Monday morning we offer our Best Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, optics, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.
1. Palmetto Armory — Rem 700 .223 Rem with Scope, $359.99
Here’s an awesome deal on a camo-finish Remington 700 hunting/varminting rig. The price is just $359.99 with scope and rings! This Rem 700 features 26” blued heavy barrel chambered in .223 Rem, Mossy Oak Camo synthetic stock, and X-Mark Pro (non-adjustable) trigger. The package comes complete with a 4-12x40mm scope. NOTE: The twist is 1:12″ so this is suitable for lighter-weight bullets. Buyers say the scope is pretty cheap, though functional. But this is still a great deal. You could pay as much (or more) just for a Rem 700 short action with trigger. Here you get a complete rifle with a pretty nice hunting stock. Order HERE.
2. Grafs.com — 10% OFF All Powders and Primers
Grafs.com is running a great reloading special right now, offering 10% OFF all powder and primers through October 3, 2018. Virtually all your favorite propellants are on sale — Accurate, Alliant, Hodgdon, IMR, Norma, Ramshot, Vectan, Vihtavuori, Winchester and more. In addition, you can save 10% on primers from CCI, Federal, Winchester and other leading brands. Shipping and HazMat fees still apply. Along with these specials, Grafs.com is offering 10% Off Peterson Brass (no listed end date on Peterson brass discount). Hats off to EdLongRange for finding these Graf’s deals.
Here’s a killer deal on a Front Focal Plane (FFP) optic good for PRS competition and tactical applications. The Vortex Viper PST 6-24x50mm scope features 0.1 Milrad clicks with an EBR-2C illuminated reticle with Mil-based hash marks. This reticle also features the “Christmas Tree” type lower half, which provides range hold-overs with horizontal markings for wind holds. Not that long ago, this scope sold for around a thousand bucks. Now you can get the Vortex Viper PST 6-24x50mm for just $649.99. That’s a great price for a PRS-ready FFP comp scope with a proven track record and rock-solid Vortex warranty. EuroOptic’s Sale price is $649.99. This is a great deal — this same scope sells elsewhere for $789.99.
4. Precision Reloading — 15% Off All Battenfeld Brand Products
Visit PrecisionReloading.com to save big on Caldwell Rests and Target Cams, Tipton Cleaning Rods and Gun Vises, Frankford Arsenal Tumbler Kits, Golden Rod Dehumidifiers, and Wheeler Engineering Reloading Tools. We use a Tipton Gun Vise, and clean brass with a Frankford Arsenal Tumbler and media separator. We also think the Caldwell Target Cam is one of the best values on the market. It out-performs long range video systems costing hundreds more. HEADS UP: While you’re shopping at PrecisionReloading.com, note that the HazMat fee is only $16 for any powder and/or primer order. That’s half what some other vendors charge.
5. CDNN — Ruger EC9S Carry Pistol, $229.99
Here’s a good little 9mm carry pistol for a crazy-low price. Right now, CDNN is selling the popular Ruger EC9S 9MM pistol for $229.99 — that’s $70 off the regular $299.00 price. This gun is light (17.2 ounces) and thin so it’s easy to carry discretely. The EC9S is 6″ overall with a 3.12″-long barrel. The EC9S features integral sights and ships with a single 7-round magazine.
6. Midsouth — New Lyman Reloading Presses on Sale
Midsouth Shooters Supply is running a big sale right on Lyman’s impressive new Brass Smith line of reloading presses. There are three models, each offering great performance and value for its class. You can save quite a bit of cash with this Midsouth Lyman Press sale. If you haven’t tried orange yet, we think you’ll be impressed. The little C-Frame is a steal at $69.99. The sturdy O-Frame Singles stage press is $154.99. And if you’re looking for a Turret press, the new 8-station Lyman Turret press ($192.99 on sale) is very impressive — with more stations than the competition, and enhanced strength/rigidity.
7. Amazon — NcStar Roll-Up Shooting Mat, $29.95
Thicker and bigger than most shooting mats under $60.00, this $29.95 NcStar Roll-Up Mat has earned excellent reviews for comfort and utility. It has 0.30″ padding plus elbow and knee panels. The mat rolls up into a compact 19.5″ W x 8.5″ H, secured by twin Velcro straps The mat is available in six colors: Tan (shown), green, black, camo, digital camo, and grey. Prices vary slightly among colors. With both carry handle AND shoulder strap, the rolled mat is easy to tote. Here are reviews from three recent verified purchasers:
“This mat is fantastic, the stitching is solid, the padding is thick enough that rocks and cactus aren’t a problem. It’s light, quick, and easy to roll up.” — Angela D.
“Excellent mat. Used it for a Project Appleseed shoot and it performed perfectly. Two days of kneeling, standing and laying on it, over a dirty, dusty shooting range. Came through it all with flying colors. Rolls nicely [and] well-constructed from high-quality materials.” — NPCoach
“Works better than I expected. Easy to roll up and unroll in seconds. Velcro ties save a lot of time. It’s not uncomfortable laying on hard, uneven ground. Great product!” — Robert
8. Midsouth — 17 HMR Ammo Sale, $33.79 for 200 Rounds
Every good varmint hunter has a 17-cal rimfire in his arsenel. The 17 HMR is ideal for small critters out to about 150 yards. Low noise and low recoil help you score multiple hits. Now’s a great time to stock up on 17 HMR ammunition. Midsouth has Hornady 17 HMR in 200-count packs for $33.79. That works out to $8.45 per 50-count box or $0.17 (seventeen cents) per round. This is good ammo — the tipped V-Max bullets are explosive on ground squirrels and prairie dogs. NOTE: Midsouth also has 500-round 17 HMR bricks for $84.99, also $0.17 per round.
9. Midsouth — 250 Adhesive Precision Targets on Roll, $12.49
Midsouth offers 250 self-adhesive Benchrest Targets on a convenient roll. These stick-on targets work great for load development. The aiming diamond helps align the cross hairs of your scope for consistent shot placement. If you set your Point of Impact to the 1/4″ grid pattern at the top it’s easy to eyeball your group size. At the bottom are fields for your load info. Each Target sticker measures 6″ x 4″ with a 4.5″ x 2.5″ printed area. Midsouth sells the 250-target roll for $12.49, discounted this week from $14.99.
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In this article, three great champions reveal their wind-calling secrets in video interviews. We first published this “Three Champions” story a few years ago. If you are a competitive shooter, and you want to learn more about reading the wind, you should watch all three of these interviews. These guys are among the best shooters to ever shoulder a rifle, and they have much wisdom to share.
At the 2010 SHOT Show, we had the unique opportunity to corner three “superstars” of High Power shooting, and solicit their wind-reading secrets. In the three videos below (in alphabetical order), Carl Bernosky (10-Time Nat’l High Power Champion), David Tubb (11-time Nat’l High Power Champion and 7-time Nat’l Long-Range Champion), and John Whidden (5-Time Nat’l High Power Long-Range Champion) shared some of the wind-doping strategies that have carried them to victory in the nation’s most competitive shooting matches. This is GOLD folks… no matter what your discipline — be it short-range Benchrest or Long-Range High Power — watch these videos for valuable insights that can help you shoot more accurately, and post higher scores, in all wind conditions.
We were very fortunate to have these three extraordinarily gifted champions reveal their “winning ways”. These guys REALLY know their stuff. I thought to myself: “Wow, this is how a baseball fan might feel if he could assemble Babe Ruth, Hank Aaron, and Ted Williams in the same room, and have them each reveal their hitting secrets.” Editor’s Note: These interviews were conducted before all three men won their most recent National Championships so the introductions may list a lower number of titles won. For example, John Whidden won back-to-back LR Championships in 2016 and 2017/
Top photo courtesy Rifleman’s Journal.
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Many of our readers travel far and wide during summer months, both on family vacations and to participate in shooting matches. When transporting firearms across state lines, it is vital to understand the laws and regulations that apply in each jurisdiction. Moreover, all of us need to stay informed about gun laws in our home states, since new laws are passed every year.
Indiana attorney Brian Ciyou has created an outstanding resource, Gun Laws by State (2018 Ed.) (GLBS), that explains firearms laws in all 50 states. Ciyou’s gun law treatise, available in both book and online (web) formats, covers state laws as well as key federal laws that apply in federal buildings, airports, National Parks, and school zones. There is a handy Reciprocity Map showing which states recognize concealed weapon permits issued in other jurisdictions. Moreover, GLBS covers Reciprocal Carry for all 50 states, Constitutional Law, Federal Statutory Law, Use of Force, Criminal Provisions, Civil and Criminal Liability, Preemption, Federal Property Rules, and Interstate Transportation. The web version of Gun Laws by State is updated regularly, and Ciyou even provides a GLBS Gun Laws Blog with current topics on gun regulations nationwide.
FREE Access to Many Database Features
Access key state and Federal legal information for FREE on the GLBS website. Simply click on an interactive map to quickly review gun laws in any state. Other Navigation links provide quick access to particular topics, such as rules for Airline Travel, Amtrak, National Parks, and Federal properties.
We recommend that readers bookmark the GLBS website. Though much free info is available, you should definitely consider buying the book if you frequently travel with firearms outside your home state. The printed book version costs $20.00, while a digital eBook costs an additional $5.00 ($25.00 total). CLICK HERE to purchase Gun Law Books and/or eBooks.
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Savage’s MSR 10 Long Range is now available in 6mm Creedmoor. We think this rifle is a good choice for PRS Gas Gun matches in the Open Division. This AR10-type rig can shoot a larger, more capable cartridge than a .223 Rem (or 224 Valkyrie). And we think the 6mm Creedmoor is definitely a good choice for tactical/practical applications. In fact in the first-ever PRS gas gun match, the winner ran a 6mm Creedmoor. (Story HERE).
The 6mm Creedmoor case design allows room for long, heavy bullets while still functioning in an AR10-size action. The 6mm Creedmoor has become popular with High Power and PRS shooters because it offers excellent accuracy, good ballistics, and moderate recoil. As explained below, the 6mm Creedmoor offers a flatter trajectory, with less recoil, compared to the “parent” 6.5 Creedmoor.
Savage’s semi-automatic MSR 10 Long Range boasts some nice features — such as a Magpul PRS Gen 3 stock, and non-reciprocating, side-charging handle. The MSR 10 Long Range also features a two-stage target trigger, plus upgraded barrel with 5R rifling and Melonite QPQ finish. MSRP is $2284.00.
Savage MSR 10 Long Range Features:
– Non-reciprocating side charging handle
– Fluted 22.5″ heavy barrel with Melonite QPQ finish, 1:7.5″-twist rate
– Custom forged upper/lower for unique look and compact size
– Magpul PRS Gen3 buttstock
– Free-float M-LOK rail
– Two-stage target trigger with nickel boron treatment; 2.5 to 4-pounds
– Chamberings: 6mm Creedmoor, 6.5 Creedmoor, .308 Winchester
Savage MSR 10 Long Range (6mm Creedmoor, 6.5 Creedmoor, .308 Win)
Ballistic Comparison: 6mm Creedmoor vs. 6.5 Creedmoor
Which has better ballistics, the 6mm Creedmoor or the original 6.5 Creedmoor? Well, the answer depends on your bullet choice and the speed of your load. We went to the Hodgdon Reloading Page and selected the MAX listed loads for H4350 for each cartridge, choosing Sierra’s 107gr MatchKing for the 6mm Creedmoor, and Sierra’s 142gr MatchKing for the 6.5 Creedmoor. Hodgdon’s max H4350 load for the 6mm Creedmoor with 107gr bullet yields 3009 fps at 60,300 psi (24″ barrel). The max H4350 load for the 6.5 Creedmoor with 142gr bullet runs 2694 fps at 59,800 psi (24″ barrel).
With these listed Hodgdon Max loads, the 6mm Creedmoor had a flatter trajectory and less wind drift. Here is a quick comparison, based on data from JBM Ballistics.
6mm Creedmoor with 107gr SMK Hodgdon H4350 Max “Book” Load, 3009 fps
Commentary — Ballistics Comparisons and “Beyond Book” Loads
We are aware that some shooters are running faster loads in both 6mm Creedmoor and 6.5 Creedmoor rifles. The ballistics comparison would also change with different bullet choices for one or both calibers. However, by using Hodgdon’s listed max loads with the SAME Powder this is a meaningful starting comparison for the two related chamberings. Bottom line, the 6mm Creedmoor shoots flatter and has less wind drift. It also definitely has less recoil. This 6mm Creedmoor load has 2150.8 ft/lbs of energy at the muzzle. The listed 6.5 Creedmoor load has 2288.0 ft/lbs of energy at the muzzle.
Of course we know some guys are running their 6.5 Creedmoor faster with 140gr-class bullets. That would alter the comparison. But if you ask most actual PRS competitors who have campaigned BOTH the 6mm Creedmoor and the 6.5 Creedmoor, they will tell you the 6mm Creedmoor has less recoil, and a somewhat flatter trajectory. That makes this new 6mm Creedmoor Savage MSR 10 rifle an interesting alternative to its 6.5 Creedmoor brother.
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After Norm Harrold won the 2018 F-Open National Championship in Raton, New Mexico, setting a new 1000-yard National Record in the process, many of our Forum members wanted to see Norm’s championship-winning rifle, and learn more about Norm’s experience at the Nationals. Read on for coverage of Norm’s equipment and .284 Shehane ammo. Scroll down and you’ll find a detailed video showing how McMillan builds the advanced Kestros ZR stocks, like the one Norm used at Raton.
Norm posted: “I made it home from Raton 2018 F-Class Nationals and what an unbelievably amazing week I had. I was blessed enough to bring home a new F-Open 1000-yard record and the National Championship! Our Team McMillan took second in Mid-range and fourth overall in Long Range. I am so thankful and blessed to have this opportunity and to be able to do it with such a stand-up group of competitors and lifelong friends. Thanks to all our sponsors: McMillan Fiberglass Stocks, Nightforce Optics, Kelbly’s [Actions], Bartlein Barrels, and Berger Bullets.”
Gun and Load: Norm’s F-Open rig features a McMillan Kestros ZR stock and Bartlein barrel chambered for the .284 Shehane, which has a bit more case capacity than a standard .284 Winchester. Norm loaded Berger 184gr 7mm bullets in Lapua brass. Norm revealed his load in an Erik Cortina YouTube Video. Fellow shooter Erik Cortina joked — “the minute this video goes live, the 184s will be hard to find”. Norm says “Stock up guys — they shoot good!”
Here Norm Harrold shows his shooting form. Note how low the McMillan Kestros ZR forearm sits on Norm’s SEB NEO front rest. Norm also uses a large footprint rear bag for enhanced stability.
Harrold Shoots 200-22X to Smash 1000-Yard F-Open Record
On a rainy day at Raton, Norm shot brilliantly to set a new F-Open National Record: 200-22X at 1000 yards. (The previous record was 200-17X.) How could he get 22 Xs for a 20-shot string? Under NRA rules, if you shoot all Xs for the full string, you are allowed to keep shooting for as long as you can put shots in the X-Ring. Norm almost missed the chance to extend his X-Count. After his 20th shot, Norm recalled, “I said ‘I’m done, give me my target’, but … my shooting partner said ‘No! Keep shooting!’” So Norm did, drilling two more Xs to set the new National Record.
Kelly McMillan Shows Design and Construction of the Kestros ZR:
In this video, Kelly McMillan explains the design features and construction methods for the Kestros ZR, a fiberglass Kestros with aluminum extension rails in the front. Kelly explains “how and why we made the stock the way we did” and he shows how to retro-fit standard Kestros stocks with the new front rails. On the ZR the rails are anchored to a reinforced area for extra rigidity. In addition, the cantilevered rails are milled to be perfectly parallel. If you shoot F-Class we strongly recommend you watch this video.
Kelly McMillan showed us the prototype Kestros ZR at the 2018 Berger Southwest Nationals.
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What is “Overbore”? That’s a question rifle shooters can debate to no end. This article from our archives proposes one way to identify “overbore cartridges”. We think the approach outlined here is quite useful, but we know that there are other ways to define cartridges with “overbore” properties. Whenever we run this article, it stimulates a healthy debate among our readers — and that is probably a good thing.
Forum Member John L. has been intrigued by the question of “overbore” cartridges. People generally agree that overbore designs can be “barrel burners”, but is there a way to predict barrel life based on how radically a case is “overbore”? John notes that there is no generally accepted definition of “overbore”. Based on analyses of a wide variety of cartridges, John hoped to create a comparative index to determine whether a cartridge is more or less “overbore”. This, in turn, might help us predict barrel life and maybe even predict the cartridge’s accuracy potential.
John tells us: “I have read countless discussions about overbore cartridges for years. There seemed to be some widely accepted, general rules of thumb as to what makes a case ‘overbore’. In the simplest terms, a very big case pushing a relatively small diameter bullet is acknowledged as the classic overbore design. But it’s not just large powder capacity that creates an overbore situation — it is the relationship between powder capacity and barrel bore diameter. Looking at those two factors, we can express the ‘Overbore Index’ as a mathematical formula — the case capacity in grains of water divided by the area (in square inches) of the bore cross-section. This gives us an Index which lets us compare various cartridge designs.”
OVERBORE INDEX Chart
So what do these numbers mean? John says: “My own conclusion from much reading and analysis is that cartridges with case volume to bore area ratio less than 900 are most likely easy on barrels and those greater than 1000 are hard on barrels.” John acknowledges, however, that these numbers are just for comparison purposes. One can’t simply use the Index number, by itself, to predict barrel life. For example, one cannot conclude that a 600 Index number cartridge will necessarily give twice the barrel life of a 1200 Index cartridge. However, John says, a lower index number “seems to be a good predictor of barrel life”.
John’s system, while not perfect, does give us a benchmark to compare various cartridge designs. If, for example, you’re trying to decide between a 6.5-284 and a 260 Remington, it makes sense to compare the “Overbore Index” number for both cartridges. Then, of course, you have to consider other factors such as powder type, pressure, velocity, bullet weight, and barrel hardness.
Overbore Cases and Accuracy
Barrel life may not be the only thing predicted by the ratio of powder capacity to bore cross-section area. John thinks that if we look at our most accurate cartridges, such as the 6 PPC, and 30 BR, there’s some indication that lower Index numbers are associated with greater inherent accuracy. This is only a theory. John notes: “While I do not have the facilities to validate the hypothesis that the case capacity to bore area ratio is a good predictor of accuracy — along with other well-known factors — it seems to be one important factor.”
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MagnetoSpeed’s technology has completely changed the market for firearms chronographs. With a MagnetoSpeed barrel-mounted chrono you can quickly and easily record muzzle velocity (MV) without having to set up tripods or walk down-range. The compact MagnetoSpeed chronos are easy to set up and transport. With the full-featured V3 model, everything you need comes in a small fitted case. In the top photo are the components used with the MagnetoSpeed V3 Kit:
1. V3 Bayonet sensor
2. Display and control unit
3. Bayonet spacers (plastic and rubber)
4. Cords and mounting hardware (left), suppressor heat shield (right)
5. Alignment rod (square cross-section)
6. Rail adapter (sold separately)
Our friend Gavin Gear of UltimateReloader.com recently reviewed the MagnetoSpeed V3 and came away impressed. Gavin explains the a good chrono is essential: “If you want to load and shoot precision ammunition, you need the tools that will produce and validate the precision of your loads. A good chronograph is one of those tools! In this post I’m going to introduce you to the MagnetoSpeed V3 chonograph, the high-end electromagnetic chronograph which fills out the top slot in MagnetoSpeed’s equipment portfolio.”
In this 11-minute video Gavin reviews MagnetoSpeed’s top-of-the-line V3 Chronograph. He shows what ships with the unit, how to set it up for both rifles and pistols, and then he puts it through its paces showing how it captures velocity data. Gavin says he will follow-up with future videos showing how to link the MagnetoSpeed V3 to your mobile phone and how to log velocity data for future reference. To learn more about this high-tech chrono, visit UltimateReloader.com.
The first-ever Precision Rifle Expo (PRE) was a success. Over 600 attendees braved hot, humid weather to attend the Expo held September 15-16, 2018 at the Arena Training Facility in Blakely, Georgia. There were 40+ exhibitors displaying products — rifles, chassis systems, actions, barrels, optics, reloading gear, ammo, and other accessories. In addition, live-fire demos and training sessions were offered on the Arena ranges.
“The shooting areas were absolutely top-notch,” said Phil Cashin, President of MasterPiece Arms. Phil praised the live-fire demos: “Never before has there been a gathering of the top professionals in the field of long-range precision shooting. Shooters are … getting the chance to learn a thing or two from these guys. You can see them on the shooting lanes, their expressions of joy when they hit a target from 500 yards to over 1 mile out.”
Comments by Precision Rifle Expo Attendees:
“I thought it was a great event. I saw many excited people who got to experience their first impacts at 1,000+ yards, and some at or past a mile.”
“I loved the opportunity to put [my] hands on so many quality products and compare them. Never have been able to do that in one place before.”
“I drove over 2,300 miles in three days. Will never wash the smile off my face after the first round hit at one mile.”
“I got to try the world’s finest scopes and [purchase one] at a huge discount!”
Precision Rifle EXPO 2018 Exhibitor List
Accurate Ordnance
Alpha Munitions
Atlas (B&T Industries)
Area 419
Armageddon Gear
Barrett
Berger
Bushnell
Cole-TAC
Curtis Custom
Defiance
Federal
GA Precision
Hunts Long Range
Kahles
Kelbly’s
Kestrel
Knights Armament
Lapua
Magnetospeed
Manners Stocks
MasterPiece Arms
McMillan Stocks
McWhorter Rifles
MDT Chassis
Nightforce
Proof Research Barrels
RCBS
Really Right Stuff
Rugged Suppressors
Schmidt & Bender
Sierra
SK Ammo
Stillers Precision
Swarovski
Timney
Trigger Tech
Vortex
Vudoo Rifles
Warnes Scope Mounts
West Texas Ordnance
Whidden Gun Works
The Arena Training Facility
The Arena Training Facility, a 2,300-acre multipurpose training complex for government, law enforcement, military and civilians, was a great choice for this first-ever event. One of the largest training facilities in the southeast, this site offered several exhibition areas, training classes in classroom settings, and live-fire training on a multitude of ranges with targets out to 2300 yards.
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