At the range today, a friend handed me one of his 308s and asked if I could tell the difference between his and mine. The difference was that his had a small rifle primer. I didn't know you could get brass that took them. My friend shoots prairie dogs to 1,000 yards, so he needs all the accuracy he can get. He said small primered (new word?) rounds are more accurate. Is this true? Do they work in the M14 platform?
Jim Horton
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Lapua Palma (small rifle primer) 308 brass...
I think to tell the difference, you'd have to be an accomplished shooter and reloader.
With ho-hum quality controls on my handloads with large rifle primers, I often achieve velocities with standard deviations in the single digits. This is usually good enough for me to get ~1 MOA accuracy. My ES numbers are frequently below factory FGMM.
Tony.
I think to tell the difference, you'd have to be an accomplished shooter and reloader.
With ho-hum quality controls on my handloads with large rifle primers, I often achieve velocities with standard deviations in the single digits. This is usually good enough for me to get ~1 MOA accuracy. My ES numbers are frequently below factory FGMM.
Tony.
IMHO, the primary advantage is that it takes a few more load-shoot cycles to loosen the primer pockets. You can probably load them a small bit 'hotter' than standard LRP .308 brass, rather a moot point in the M14.
6.5 grendel and 6.5 cm is the same way. Some brass is meant for small primer, others large. For 6.5 grendel I get better standard deviations with large primer, and the opposite with 6.5 cm. Guess it all depends on that particular rifle, like everyone typically says.
Peterson makes 6.5 Creedmoor brass in small and large rifle primer. My cursory research showed the small primer case might be 'better'.
I don't doubt it. He coats his bullets and uses a Mauser action behind a 308 barrel at least 1" in diameter. It's an extremely heavy rig.
I can well remember some years ago a friend who was also shooting with me went on the "hunt" for small primer pocket brass for his 308 rounds. Claimed it would give him better scores than the std. large primer brass. He did find some and his scores were no better than ever before the switch. There is so much more involved in precise shooting at 600-1000yds. than the size of the primer pocket and if those are not recognized and practiced from the beginning then the primer pocket size becomes unimportant in my opinion. Never used small primers and did make High Master in NRA Long Range shooting w/peep rear sight, globe front sight and sling and shooting mat, no artificial support involved.
Small primer pockets don't open up as readily as the large ones, which equates to more firings per case.
Small rifle primers seem to be more available right now than large.
Small rifle primers seem to be more available right now than large.
I load for 2 cartridges that use small rimer primers, .308 for my Palma rifle and 6x47, both with Peterson small rifle primer brass. These cartridges both give me SD's in the single digits. The only drawback associated with small rifle primers can be due to extremely cold weather and possibly poor ignition.
John
John
There's one other difference between small and large rifle brass, small rifle primer cases like, .308, .243 and 6x47 Lapua for example, usually are for competition shooting and have a smaller flash hole (around .062) in the primer pocket. My understanding of the reason for this is that the "Jet" of flame from the primer is stronger and reaches further into the powder column for better ignition.
John
John
Whoa Joe!…I was wondering when someone was gonna mention the Remington BR brass from the 70’s!!! Back when Big Green introduced the 22 and 6mm BR, you had to form your own brass from that URBR brass which came as thin walled, soft annealed, small primered 308 cases. Highpower folk immediately seized on the BR brass looking for more case capacity and more consistent ES’s.
Add Alpha to the folks making SR 308 cases. The folk touting longer case life got that as a byproduct of chasing tighter elevations at LR.
You’ve sold me more M1A exclusive reloading crap than Carter has pills.
When I move to Missouri the loading room/vault is going to need about a 3’ section of butcher block devoted to the new M1A stuff.
Even bought a gang box to store the stuff in until the move.
Been running a race with inflation since retirement on this stuff.
Updating a sizable portion of the reloading gear.
When I move to Missouri the loading room/vault is going to need about a 3’ section of butcher block devoted to the new M1A stuff.
Even bought a gang box to store the stuff in until the move.
Been running a race with inflation since retirement on this stuff.
Updating a sizable portion of the reloading gear.
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