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<blockquote data-quote="SDMF" data-source="post: 439063" data-attributes="member: 412">Give or take, once you go over 55K PSI in any brass case, your primer pockets have a &quot;lifespan&quot;.You can keep the neck and shoulder &quot;alive&quot; almost indefinitely by proper sizing and timely annealing, but, get up into the low-mid 60K PSI range and primer pockets don't last forever.&nbsp; Some last longer than others, but, they all eventually fail to crush-fit a primer.80K PSI is up in the range where in a brass case you pierce the primer, flame-cut nice little &quot;pits&quot; into your bolt face, and get a face-full of escaping gases.&nbsp;&nbsp; And/or the primer-pocket fails completely and when you open the bolt (if you can) the case comes out and the primer falls down into the magazine or trigger mechanism.It's hard to say, but, it might make more sense to people if we got rid of &quot;caliber headstamps&quot; like 308Win and instead called out cases by their projectile diameter, case length, case capacity, and PSI ratings.&nbsp; If you've got a bore diameter, case capacity, and max PSI it becomes more difficult to be enamored with a &quot;head stamp&quot; as something magical.The 308 x 51 x 56 x 62,000 doesn't exactly roll off the tongue like &quot;308 Win&quot; or &quot;7.62 NATO&quot; though.It'll be interesting to see as more steel case offerings and reloading tools become available how the manufacturers go about dealing with the steel portion of the cases.&nbsp; Previous to the .277Fury or this new 7 BackCountry, the way to deal w/steel cases was to lacquer the cases and chrome line chambers and bores.&nbsp; Currently it looks like nickel-plating at least the steel portions of the case is how they get around &quot;stickage&quot;.&nbsp; At bottleneck cartridge pressures, nickel eventually flakes off though.&nbsp; When that happens you run the risk of galling dies, or worse, chambers, bolt-lugs and/or bolt race-ways.I'll admit, that a modest 22&quot; bbl with what most consider a fairly &quot;short&quot; 6&quot; suppressor, isn't nearly as &quot;handy&quot; as a straight 22&quot; overall bbl length.</blockquote>

[QUOTE="SDMF, post: 439063, member: 412"] Give or take, once you go over 55K PSI in any brass case, your primer pockets have a "lifespan". You can keep the neck and shoulder "alive" almost indefinitely by proper sizing and timely annealing, but, get up into the low-mid 60K PSI range and primer pockets don't last forever. Some last longer than others, but, they all eventually fail to crush-fit a primer. 80K PSI is up in the range where in a brass case you pierce the primer, flame-cut nice little "pits" into your bolt face, and get a face-full of escaping gases. And/or the primer-pocket fails completely and when you open the bolt (if you can) the case comes out and the primer falls down into the magazine or trigger mechanism. It's hard to say, but, it might make more sense to people if we got rid of "caliber headstamps" like 308Win and instead called out cases by their projectile diameter, case length, case capacity, and PSI ratings. If you've got a bore diameter, case capacity, and max PSI it becomes more difficult to be enamored with a "head stamp" as something magical. The 308 x 51 x 56 x 62,000 doesn't exactly roll off the tongue like "308 Win" or "7.62 NATO" though. It'll be interesting to see as more steel case offerings and reloading tools become available how the manufacturers go about dealing with the steel portion of the cases. Previous to the .277Fury or this new 7 BackCountry, the way to deal w/steel cases was to lacquer the cases and chrome line chambers and bores. Currently it looks like nickel-plating at least the steel portions of the case is how they get around "stickage". At bottleneck cartridge pressures, nickel eventually flakes off though. When that happens you run the risk of galling dies, or worse, chambers, bolt-lugs and/or bolt race-ways. I'll admit, that a modest 22" bbl with what most consider a fairly "short" 6" suppressor, isn't nearly as "handy" as a straight 22" overall bbl length. [/QUOTE]

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