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338 RCM
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<blockquote data-quote="Calvin45" data-source="post: 2786011" data-attributes="member: 109862"><p>That's interesting for sure. And I'm not suggesting that the load in question isn't over 65kpsi. It almost certainly is though these progressive burn rates like rl17 and superformance do weird things sometimes in your favour…sometimes NOT! Total area under the curve can be way greater without a higher peak pressure. And honestly I don't think exceeding 65k by a little is that big of a deal. Hard on brass. Not "catastrophic failure in your face" territory. And the guy's primers not only aren't cratered, but the edges ain't pancakes. That does tell me something. Yes different headspacing and chamber tolerances will show pressure at different levels (I had a .300 win that Showed cratering and ejector swipe with most factory ammo) but that edge of primer flattening out isn't part of that same equation I don't think. Same with stiff bolt lift. If his primers look fine, his brass is fine, he's not loosening pockets in just a few firings, the bolt can easily be lifted with one finger (my personal practice, the one finger rule!) and his velocity isn't something simply impossible at sane pressure then if I were in his shoes I wouldn't worry at all. That's just me tho.</p><p></p><p>I sure wish more sources of data from large companies would spring the extra cash for some real pressure data like hodgdon does for theirs. Thanks for sharing that tho it certainly does raise an eyebrow.</p></blockquote><p></p>
[QUOTE="Calvin45, post: 2786011, member: 109862"] That’s interesting for sure. And I’m not suggesting that the load in question isn’t over 65kpsi. It almost certainly is though these progressive burn rates like rl17 and superformance do weird things sometimes in your favour…sometimes NOT! Total area under the curve can be way greater without a higher peak pressure. And honestly I don’t think exceeding 65k by a little is that big of a deal. Hard on brass. Not “catastrophic failure in your face” territory. And the guy’s primers not only aren’t cratered, but the edges ain’t pancakes. That does tell me something. Yes different headspacing and chamber tolerances will show pressure at different levels (I had a .300 win that Showed cratering and ejector swipe with most factory ammo) but that edge of primer flattening out isn’t part of that same equation I don’t think. Same with stiff bolt lift. If his primers look fine, his brass is fine, he’s not loosening pockets in just a few firings, the bolt can easily be lifted with one finger (my personal practice, the one finger rule!) and his velocity isn’t something simply impossible at sane pressure then if I were in his shoes I wouldn’t worry at all. That’s just me tho. I sure wish more sources of data from large companies would spring the extra cash for some real pressure data like hodgdon does for theirs. Thanks for sharing that tho it certainly does raise an eyebrow. [/QUOTE]
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