Many 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 6mmBR 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. Compared to the .308 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. Recoil is less than half of the .308 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 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 my favorite cartridge out to 500 yards, and I like the .308 Win for F-TR. The .308 Win has shown outstanding accuracy, as displayed at the NRA F-class Nationals. And… if you want to shoot at the Palma Championships at Camp Perry, Ohio or Bisley in the UK there’s only one choice — a .308 Win.
This Sunday GunDay story celebrates an impressive victory by Raymond (“Ray”) Gross, one of America’s most skilled marksmen and a top team coach. Ray has mastered many disciplines including Service rifle, Palma rifle, and F-Class (both F-TR and F-Open). Recently Ray notched another notable victory at the CMP’s 2026 National Matches at Camp Perry, Ohio, winning the Kerr Memorial Match (Palma Rifle division).
Report by Ray Gross
I had a successful trip to Camp Perry this year, winning the Palma Rifle division of the 1000-yard Kerr Memorial Match and winning two Golds and a Silver coaching in the three team events. This is actually my first time back at Camp Perry for Long Range since 2015. I really enjoyed my time there this year.
For the Kerr match, I used my standard Palma rifle. My Barnard action and Master Class / Robertson stock have been with me for 21 years now and have seen numerous barrels and a few upgrades to the stock. The stock has a bedding block and originally I had two Barnard actions that I would swap in and out. I currently use the standard Barnard P Trigger, set to 1.5 kg.
This rifle has a Warner rear sight with true 1/4 MOA clicks. It is fitted with a Gehmann 530-0 rear diopter. The front sight is a Doug Beach 22mm ladder sight with a Centra 5.0-7.0mm adjustable aperture. For my eyesight (-2.75 x -0.75 in my aiming eye), I will generally run 5.1 to 5.6 on the 1000-yard target. At that size, I am more or less cutting the corners off the 6×6 target. Most of the ranges I shoot at have a large, dark-colored safety berm behind the target.
Camp Perry has a rather unique sight picture at 1000 yards, with the target surrounded on three sides with open sky, but with the dark pit safety berm below. It took a little bit to get used to that. The dark pit berm was prominent inside my aperture, even when turned down to 5.0. Next year, I plan to swap out the from aperture to allow me to get down to about a 4.7-4.8mm size.
The barrel is a Bartlein 5R 300×308 Light Palma taper. Chad Heckler of 5×5 Precision chambered this barrel for me. I recently troll-posted some bore pics on Facebook of this barrel at about 750 rounds. I work at Manson Reamers primarily as a chamber designer and tech support role and get to hear many stories about chambers and barrels. I think a lot of people really misjudge what they are seeing with borescopes causing a lot of worry and anxiety. The real measure of a target rifle is how it performs in competition.
Leaving Camp Perry it has about 1500 rounds down the tube and is shooting plenty good enough to win at the National Championships. By the way, I showed up with about 30 rounds fired since the previous thorough cleaning and did not clean once while there. I am not necessarily recommending that, but this barrel shoots fine dirty.
I am on my 16th firing of the Lapua large primer .308 Win brass. I have a bunch of new small primer brass that I want to use, but the lot I have been using just won’t wear out, so I keep reloading it. My Perry ammo was loaded with Vihtavuori N150 powder, but I started the year with N140 to use up that particular jug of powder. My bullet of choice for long range with the Palma rifle is the Berger 155.5 gr FullBore Target Rifle bullet seated about .035″ off the lands. Editor: The video below provides a comparison of Lapua large primer .308 Win brass vs. Lapua small primer .308 Win brass.
Most of my recent Palma barrels have the Manson 308 Win 2019 Fullbore T30 chamber (that I designed). That is a very widely-used chamber designed to pass Bisley Rule 150 inspection. It is a ‘Bisley Reamer’. Bisley reamers tend to have fairly long throats. I have a collection of various ‘Bisley Reamer’ prints from all over the world. The Manson 2019 Fullbore T30 is not the longest, but it is among the longer throated designs. SEE Diagram below (click to zoom):
Since 2019 I have had a number of competitors request a shorter-throated chamber in hopes of achieving higher velocities with the NRAUK Bisley issued ammo, currently made by GGG*. The issue ammo is essentially old school Palma ammo with a Sierra 2155 seated to 2.80″ COL. The Sierra 2155 is a very accurate bullet, but it does not have the BC of more modern 155gr designs. I love shooting them at 300 and 600 yards. If you want to learn to read the wind, practice with them at long range.
The chamber in this rifle is a ‘prototype’ shorter-throated reamer designed with the help of Brandon Green and measurements of the GGG 2025 issued ammo*. The reamer is the GGG25 reamer. On the print I have a big disclaimer that the chamber probably will eventually fail the rule 150 test as bullets change over the years, but it did pass with the 2026 issued ammo. My recommendation is to stick with the 2019 Fullbore design if you plan to go to Bisley.
Video shows first 2.5-3″ of another one of Ray’s Palma barrels, with an estimated 2800 rounds.
Ray reports that approximately 70 rounds had been shot in this barrel since it was last cleaned.
Ray says his Palma rifles shoot well even with high round count between cleanings.
Here is Ray shooting his Palma rifle at Winnequah Gun Club Range in Lodi, Wisconsin.
Ray Gross Marksmanship/Coaching Biography Ray’s shooting career began early in life hunting with his Dad. He began competing in NRA matches in 1991 as a Service Rifle shooter and earned a place on the Michigan Rifle team in 1993 and 1994. He earned his Distinguished Rifleman’s Badge in 1995 and began competing in the Palma class that year.
Ray has represented the USA as a Shooter or Coach on two Palma teams, two Australia Match Teams, and eight America Match teams. He has been the winning team coach on numerous events in Canada and the USA over the last decade. His international accomplishments include a Silver medal as a shooter on the 2003 U.S. Palma Team, a Silver medal as coach on the 2015 U.S. Palma Team, two Gold medals as a coach on the 2008 and 2014 U.S. America Match Team. The 2014 team set a new record for team aggregate score. He was Captain of the 2016 Gold medal America Match F-Class Team.
In F-Class, he was the F-TR individual Silver medalist at the first F-Class Nationals in 2004 and has coached the F-TR National Championship Team squad in 2004, 2008, 2011, 2012, 2014 and 2016, the latter five as part of Team Sinclair.
* GGG ammo is high-grade rifle ammunition produced by Giraitės Ginkluotės Gamykla, a state-owned Lithuanian manufacturer established in 2000. It is the largest military and civilian small-caliber ammunition producer in the Baltic states, supplying strict NATO-specification rounds like 5.56x45mm and 7.62x51mm, alongside commercial .223 Rem and .308 Win loads for civilian shooters.
Do you use factory ammo for your hunting rifles? Or perhaps you buy bulk centerfire ammo for your AR15 or varmint rifle. Or do you shoot a variety of rimfire ammo? 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.
Ammo & Ballistics 6 contains data and illustrations on the vast majority of sporting cartridge types sold in the USA: 200-plus cartridge types from .17 Mach 2 up to .700 Nitro Express.
Extensive Cartridge Coverage: Contains data for over 200 cartridge types. Load Database: Includes over 2,600 different loads and 3,000 ballistic tables. Detailed Metrics: Provides information on bullet weight, type, velocity, energy, wind drift, bullet drop, and ballistic coefficients up to 1,000 yards. Choose Hunting Ammo:Ammo & Ballistics 6 helps you select ammo for a hunt — quickly compare the velocity and knock-down power of various commercial ammo.
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 .22LR 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
Flattest-Shooting Cartridges by Caliber (Ron Spomer)
In this 15-minute video, hunting expert Ron Spomer examines a variety of standard and wildcat cartridges from .17 caliber all the way to .338 caliber. For each caliber, Ron picks a flat-shooting “winner” and provides some ballistics comparison tables. This video is quite popular, with over 550,000 views on YouTube.
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 MatchKing 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.
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!”
Our friend Dennis Santiago is a talented Service Rifle shooter, who regularly competes with an AR shooting the .223 Rem cartridge. A few seasons back, he decided to go over to the “dark side”, putting together a Palma (fullbore) rifle chambered for the .308 Winchester. Dennis selected a Competition Machine (Gary Eliseo) R1 Chassis for the project. Here’s Santiago’s account of his “true blue” Palma build.
Palma Rifle Report by Dennis Santiago
“This project was a .308 Win Palma rifle with an Eliseo R1 chassis, Rem 700 action (blue-printed with PT&G upgrades), Jewell trigger, Boots Obermeyer 1:11″-twist barrel, and Phoenix sights holding Gehmann apertures. Next comes chassis and sling set-up, initial mechanical zeroing, and load development. Yup, I have a bunch of Peterson small primer .308 brass, Sierra #2156 155gr MKs, and Varget to get started with. I’m told I can drive 155gr pills to stay supersonic to 1K. Should make for an interesting 2020. My goal was to be cozy with this blue beast by the time the Berger Southwest Nationals kicked off in February 2020.”
CLICK Imagefor full-screen photo with more detail.
Pinning the Picatinny — For a Super-Solid Mount
One of the key parts of the build, Dennis explains, is mounting the top rail with pins: “Once the rail is aligned using a spin-centered optic, it locks down with three 3/16″ roll pins. That way there is no reliance on screws that can come loose. Above is a photo of the top of the Eliseo tube chassis showing the three, 3/16″ roll pins that unitize the Picatinny rail. You can also see the four brass screws that just kiss the action to fully stabilize it in the tube. The recoil ring buttresses completely around the action with metal to metal contact. There are a million details hidden inside a Gary gun.”
Phoenix Sights Front and Rear
Rise of the Phoenix — Here are the sights for the Eliseo R1. There are very few manufacturers left making these kinds of ultra-precise and repeatable iron sights.
These Ray-Vin tools help set mechanical zero on the sights. Dennis notes: “Finally a reason to pull out the Ray-Vin calibration paraphernalia to set up a mechanical zero. This photo is for all of you who still remember that those barrel flats and screws in our sight towers actually had a purpose once upon a time.”
Sling ‘N Irons — Classic Palma Configuration Dennis plans to use an Eric Hollis sling with his new blue Palma rifle.
Peterson Small Primer .308 Win Brass for Santiago’s Rig
Dennis has used Peterson Cartridge Small Rifle primer .308 Win brass. Peterson offers a “Select” version weight-sorted and length-sorted at the factory. All Select casings (in a 50ct box) are guaranteed to be within 1 grain in weight and .001″ in OAL. Peterson Select brass is available for 20 different cartridge types, including .308 Win both small primer/small flash hole and large primer/large flash hole.
Now Adapted with a Scope
Currently (in 2025) Dennis has this rifle fitted with a high-magnification Nightforce zoom scope, and he competes with his blue prone rifle in the “Any-Any” division. He usually runs the scope at about 22X power. For an older guy with aging eyes, being able to run high-magnification optics is a big plus.
With the optics Dennis has found the rifle to be exceptionally accurate. Shooting 168gr bullets it has produced 5-round groups around 1/3-MOA during testing. And it can easily hold the X-Ring at 300 yards.
Getting the Blue Rifle Ready for the Berger SW Nationals
Dennis has campaigned his rifle at recent Berger Southwest Nationals (SWN) events. At the SWN a Palma shooter can shoot iron sights, or also fit a scope and shoot in the “Any Sights” category. The week-long Berger SWN is the biggest rifle match in the Western United States. Hundreds of shooters compete in both individual and team events. The SWN begins with the Mid-Range Nationals at 600 yards. Then the Long-Range matches are held, with targets out to 1000 yards. Watch the video to see the Ben Avery facility, home of the Berger SWN:
Chassis-maker Gary Elesio at the 2017 Berger SW Nationals. Gary shoots what he sells:
The Tikka T3x Ace Target was named the 2026 American Rifleman Golden Bullseye “Rifle of the Year”.
The Tikka T3x ACE Target rifle has been named the 2026 American Rifleman Golden Bullseye Rifle of the Year, a highly coveted award presented annually by NRA Media. This impressive factory rifle is a great choice for PRS/NRL competition. It boast a good chassis with full-length ARCA rail, modular magwell, and adjustable cheekpiece. The action is smooth with a nice fluted bolt and big bolt handle knob. On top of the action is a +20 MOA Picatinny rail which helps with long-range shooting. This rifle has shown very good accuracy with factory ammo, aided by an excellent 2-stage trigger that adjusts from 2 to 4 pounds.
Available chamberings are .223 Rem, 6.5 Creedmoor, and .308 Win with prices starting at $1799.00 at EuroOptic.com. The 6.5 Creedmoor with 26″ barrel would be our choice for PRS/NRL competition.
SPECIAL REPORT: NEW Tikka T3x Ace Target Rifle for PRS/NRL
Tikka is best known for its rugged and accurate hunting rifles. But recently Tikka has introduced an impressive new line of T3x Ace Target chassis rifles. These 10.6-lb rigs have impressive alloy chassis stocks, with modular M-LOK and Arca-Swiss compatible fore-ends, and interchangeable magwells. Optimized for PRS/NRL competition, the Tikka T3x Ace Target has a fine 2-stage adjustable trigger, plus a rear stock section with adjustable cheek-piece and nicely-designed attached lower bag rider. NOTE: Tikka also offers the rimfire .22 LR Tikka T1x Ace Target rifle for practice and competition. This is cool because NRL-22 Matches are now very popular.
Accuracy Testing Results Rifle Shooter, a leading UK gun publication, did extensive accuracy testing of the Tikka T3X Ace Target. This testing is featured in the above video. Shooting from a bench with rear bag and front tripod, the test rifle delivered MOA (or better) accuracy with five out of six types of factory ammo. The best group, 0.68″ for 5 shots, was shot with Lapua ammunition with 167gr Scenar bullets. Here are the test results:
In another test of a Tikka T3X Ace Target, top F-Class shooter Erik Cortina achieved half-MOA or better groups with SAKO 6.5 Creedmoor ammo. Watch Erik shoot the Tikka T3x Ace Target in the video below, starting at 8:22 time-mark.
Tikka T3X ACE Target Rifle Features
2-Stage Adjustable Trigger (2-4 lbs)
Spiral-fluted Bolt with Coned Head
+20 MOA Picatinny Scope Rail
Free-floating Hammer-Forged Barrel
Adjustable Cheekpiece and Buttpad
10-shot steel CTR/Tac-style Magazines
23.6″ or 26″ Heavy Barrels with 5/8″-24 threaded muzzles
Full-length RRS ARCA Swiss Rail with barricade stop, M-Lok & QD Sling Mounts
Optional Factory External and Internal Weights
Two Colors: Black or Cerakote Midnight Bronze
Optional Cerakote coating
According to Rifle Ready: “The new Tikka T3X Ace lineup exploded out of SHOT Show 2025 and instantly became one of the most talked-about precision rifles of the year — and for good reason. With multiple testers recording sub-half MOA groups and even extended 15-shot strings under 1 MOA, the Ace is delivering near-custom accuracy right out of the box. Built on the legendary T3C action and paired with a full competition-ready chassis, the Ace Target and Ace Game rifles blend Finnish craftsmanship with modern modularity in a way Tikka fans have waited years for.”
Want to learn more? A Rifle Ready video released this month showcases Tikka T3X features. It covers real-world accuracy tests, reviewer impressions, and the differences between the Target and Game variants. This video does help explain why some shooters say the Ace “beats rifles triple its price”.
In promoting its rifle, Tikka posted: “The T3x Ace Target, crafted with Tikka’s legendary attention to detail, was developed for precision shooters seeking an out-of-the-box competition-ready platform. With its optimized barrel profile, enhanced ergonomics, and refined trigger system, the Ace Target embodies the advanced engineering and shooter-focused design Tikka is known for.” The video below features a test of the .223 Rem variant.
Many 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.
Hunting season kicks off this month in many parts of the USA. If you have a new hunting rifle or need to develop a load for your rig with a new choice of bullets and/or powder, this article can help. Ace shooter Keith Glasscock explains how to develop a good load for a hunting rifle or varmint rifle.
Keith is an outstanding competitive shooter, who has finished second at the F-Class National Championships (F-Open) multiple times. Keith is also a skilled wind coach who runs the popular Winning in the Wind YouTube Channel. Along with his interest in mid-range and long-range F-Class competition, Keith also enjoys game hunting and varmint adventures.
Developing accurate hand-loaded ammo for hunting and varmint rifles involves procedures that may be a bit different than load testing for a match rifle. You want to be efficient, and use the types of brass and bullets you’ll be using on the hunts. In two recent videos, Keith shows how he developed good, accurate loads for a .223 Rem varmint rifle and a .308 Win hunting rifle.
.223 Rem Load Development — Powder Charge and Seating Depth
In the first video, Keith covers the load development process for a Remington 700 bolt-action varmint rifle chambered in .223 Remington. Keith starts by full-length sizing the brass. Then he experimented with powder charge weights, and came up with a promising load of 24.7 grains of Alliant AR Comp with Hornady 50gr A-Max bullets.
Next Keith experimented with seating depths (see 5:30-6:100) and found that accuracy improved as he changed OAL length in .005 increments. Keith ended up with 2.270″ with a 3-shot group in the twos! This video shows the importance of testing your bullet choice at various seating depths. Keith shoots this rig prone off bipod, which is similar to the bipod shooting he does in the varmint fields. Keith explains key factors to consider when optimizing the .223 Rem cartridge in a varmint rig. Velocity readings are made with a LabRadar unit.
Load Development for .308 Win Hunting Rifle
In a second video, Keith shows the process for load development with a .308 Winchester hunting rifle. Here Keith uses a large X-type sandbag for a front support. Again, he was shooting a Remington 700 bolt-action rifle, this time with Barnes TSX solid copper bullets, PPU Brass, Federal 210m primers, and AR Comp powder. Keith said the Barnes bullets were excellent — he commented that these bullets were “match quality in terms of precision”. Keith achieved some very small three-shot groups with AR Comp and the TSX projectiles. Keith did note that point-of-impact shifted up significantly with increases in charge weight (see 6:20-7:10). With thinner-contour hunting barrels, this is not unexpected. But POI change should be observed carefully during load development, as you may need to adjust your zero after completing testing.
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 MatchKing 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.
Many 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 6mmBR 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.
The barrel is a Bartlein 5R 300×308 Light Palma taper. Chad Heckler of 5×5 Precision chambered this barrel for me. I recently troll-posted some bore pics on Facebook of this barrel at about 750 rounds. I work at Manson Reamers primarily as a chamber designer and tech support role and get to hear many stories about chambers and barrels. I think a lot of people really misjudge what they are seeing with borescopes causing a lot of worry and anxiety. The real measure of a target rifle is how it performs in competition.
Ray’s shooting career began early in life hunting with his Dad. He began competing in NRA matches in 1991 as a Service Rifle shooter and earned a place on the Michigan Rifle team in 1993 and 1994. He earned his Distinguished Rifleman’s Badge in 1995 and began competing in the Palma class that year.
