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Old 12-05-2012, 07:44   #23
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Join Date: Dec 1998
Location: cogan station, pa, usa
Posts: 3,538
Originally Posted by Travclem View Post
5.56 NATO is around 60,000 psi and SAAMI .223rem is 55,000psi.
Pressure is important but so is rearward bolt thrust. You need more diameter (larger case head)/larger bolt lugs and bolt mass to control all that. Bigger round = bigger action because the build materials are the same. Compare the Thompson Contender and Encore frames for example. One can handle .308 and the other can not.

Last edited by mgs; 12-05-2012 at 07:45..
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