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Rifles, Reloading, Optics, Equipment
Reloading
6.5 PRC Over pressure with H1000 and 156 Bergers
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<blockquote data-quote="vancewalker007" data-source="post: 2239607" data-attributes="member: 66917"><p>If some of those cases didn't size correctly around the web you can get pressure that will pop a primer. The case has no space to expand and wham-o. With this cartridge you really need to get that web area down to .532in or less. I've found even .5325 can cause pressure spikes. If this friend is running tight against his rifles max then he is putting a lot of pressure/work on his cases which can also make them hard to resize. I've found that cases that have experienced pressure in my rifle will not size down in the web area no matter what I do. This can show with a mark from an ejector on the base or a heavy swipe and tight extraction bolt lift.</p><p></p><p>I have started carefully checking each case I resize in my rifle as I go. I am using the Hornady Match Grade FL die with .294 first pass and .290 final bushings. If a case closes even slightly tight and I cannot get the dimension down I toss it. If you have your die set right resized cases should close almost as easy as fresh unfired cases. Also, against Dogma I started bumping my shoulder 4-5 thou instead of 2 on this cartridge. This seems the help get all the case dimension smaller with the die I am using. It took some careful measuring and screwing the die in and out some but it has paid off in getting cases I was ready to toss back into working shape.</p><p></p><p>BTW - My rifle maxed out at 58.6gr of H1000 with the 156 EOL, Hornady cases, CCI BR2s. I have found that mag primers can raise pressure a little in short mags as well. I quit using them back in my 270/300 WSM days. My rifle is a Defiance Deviant Ultra-light XM, 26in Proof Sendero with more chamber lead than SAAMI so at 15 off the 156 EOL base is a hair above the neck shoulder junction. So I have a lot of case space for internal ballistics. He may want to more carefully re-do his max load check and be more critical about where he feels pressure. Like calling any resistance on the bolt a pressure sign. Your better off dropping a few FPS and putting less pressure on cases in the long run.</p></blockquote><p></p>
[QUOTE="vancewalker007, post: 2239607, member: 66917"] If some of those cases didn't size correctly around the web you can get pressure that will pop a primer. The case has no space to expand and wham-o. With this cartridge you really need to get that web area down to .532in or less. I've found even .5325 can cause pressure spikes. If this friend is running tight against his rifles max then he is putting a lot of pressure/work on his cases which can also make them hard to resize. I've found that cases that have experienced pressure in my rifle will not size down in the web area no matter what I do. This can show with a mark from an ejector on the base or a heavy swipe and tight extraction bolt lift. I have started carefully checking each case I resize in my rifle as I go. I am using the Hornady Match Grade FL die with .294 first pass and .290 final bushings. If a case closes even slightly tight and I cannot get the dimension down I toss it. If you have your die set right resized cases should close almost as easy as fresh unfired cases. Also, against Dogma I started bumping my shoulder 4-5 thou instead of 2 on this cartridge. This seems the help get all the case dimension smaller with the die I am using. It took some careful measuring and screwing the die in and out some but it has paid off in getting cases I was ready to toss back into working shape. BTW - My rifle maxed out at 58.6gr of H1000 with the 156 EOL, Hornady cases, CCI BR2s. I have found that mag primers can raise pressure a little in short mags as well. I quit using them back in my 270/300 WSM days. My rifle is a Defiance Deviant Ultra-light XM, 26in Proof Sendero with more chamber lead than SAAMI so at 15 off the 156 EOL base is a hair above the neck shoulder junction. So I have a lot of case space for internal ballistics. He may want to more carefully re-do his max load check and be more critical about where he feels pressure. Like calling any resistance on the bolt a pressure sign. Your better off dropping a few FPS and putting less pressure on cases in the long run. [/QUOTE]
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Reloading
6.5 PRC Over pressure with H1000 and 156 Bergers
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