Benefits of srp in 6.5 Creedmoor
- Thread starter Jab1134
- Start date
Rifle Shooter Magazine discusses this here (https://www.rifleshootermag.com/editorial/the-small-rifle-vs-large-rifle-primer-debate/329988):
"Advantages of using a Small Rifle primer rather than the typical Large Rifle version are twofold. Use of the smaller, less aggressive cap can result in better consistency, particularly in the form of tighter standard deviations. While this matters little inside common hunting distances, it’s a big deal to shooters reaching past a half-mile, where a mere 20-fps difference between shots can equate to inches of vertical impact difference on the target.
Additionally, a small primer pocket leaves more material intact than a large primer pocket. The case head is left stronger and less susceptible to pressure-caused deformation. Handloaders searching for the last iota of long-range performance can push bullets faster—using aggressive charges on the cusp of safe pressure limits—without loosening primer pockets."
"Advantages of using a Small Rifle primer rather than the typical Large Rifle version are twofold. Use of the smaller, less aggressive cap can result in better consistency, particularly in the form of tighter standard deviations. While this matters little inside common hunting distances, it’s a big deal to shooters reaching past a half-mile, where a mere 20-fps difference between shots can equate to inches of vertical impact difference on the target.
Additionally, a small primer pocket leaves more material intact than a large primer pocket. The case head is left stronger and less susceptible to pressure-caused deformation. Handloaders searching for the last iota of long-range performance can push bullets faster—using aggressive charges on the cusp of safe pressure limits—without loosening primer pockets."
If you read the whole article his test showed it matters little which size primer as far as SD and accuracy. Small primer pocket brass can last longer, but I'll use large primers because I shoot in temps ranging from below zero to 100°F.
I appreciate the info , I am a long range shooter and I do hand load and I rebarreled my Bergara and I got new srp Lapua brass and I was just shooting a light load to start my load work up and I was creatoring every primer before getting up to any reasonable speed or pressure . I’ve heard guys upgrading or having work done to there bolt on Bergara action, I was just wanting to understand the benefits of running srp. Thanks very informative
Your firing pin hole probably needs to be fixed. I have seen this with Remington, Bergara, and other actions. In my experience large rifle primers are less likely to blow out with an out of spec firing pin hole. It probably has something to do with not being able to load hotter than with a small primer.
Send it to LRI to have them install a striker pin bushing in the bolt face.
Send it to LRI to have them install a striker pin bushing in the bolt face.
GUNSMITHING SERVICES: STRIKER PIN BUSHING: M7, M700, M70(PF AND CRF), ACCURACY INTERNATIONAL, BERGARA, HOWA 1500, & RUGER RPR
A relatively frequent complaint with M700 and Accuracy International actions (and others) are cratered primers with factory made ammunition. The root cause of this is from excessive clearance between the striker and the hole through the bolt face. When fired, the primer cup flows into the void...
www.longriflesinc.com
I agree with Both points.
1. Smaller SD is one theory. However, please note that the 6.5 Creedmoor is nothing more than a 6XC with a 6.5mm stuffed into the neck. The 6XC was designed first (by David Tubb) and his testing on the 6XC design was that a small primer was not more beneficial than the large primer in the 6XC size case. Consequently, it leads me to conclude that lower SD is unlikely to be a result in the same case just because a 6.5mm has been stuffed into the neck. Conclusion: lower SD is a theory but not significant impact on performance.
I shoot an international discipline and have
used the large primer as well as the small primer 308 Lapua brass and could not tell a difference between the performance of the two at 1,000yds.
2. Small primer pocket = more brass left in the base of the case and consequently it can handle slightly higher pressure before primer pockets expand. If you are shooting loads that hot then you should reconsider because it is not safe.
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