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Hunting
Long Range Hunting & Shooting
260 Rem Vs. 6.5-06
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<blockquote data-quote="Bart B" data-source="post: 608852" data-attributes="member: 5302"><p>All your comments are well, and very realistically, stated. But I think this one needs a tiny bit of adjustment.</p><p></p><p>Most modern actions and barrels will start stretching past their elasticity limits at about 100,000 psi (about 78,000 CUP) and finally start to come apart at about 120,000 psi (91,000 CUP). Some may well be stronger.</p><p></p><p>Cartridge brass is weaker. It starts stretching past its elasticy limits at about 81,000 psi (about 65,000 CUP). This is the limit that's been exceeded when a fired case head extrudes back into holes or cutouts in the bolt face.</p><p></p><p>When I talked with a SAAMI rep some years ago, he said it was the safety issues with cartridge brass that was their prime safety criteria for modern rifles. No doubt that some makes are stronger than others. The reason is different actions have different amounts of unsupported areas around the case head. But yes, some of the older ones didn't have as good of steel in them so their maximum peak pressure levels had to be lowered.</p><p></p><p>So yes, "SAAMI puts the max pressure standard on these cases."</p></blockquote><p></p>
[QUOTE="Bart B, post: 608852, member: 5302"] All your comments are well, and very realistically, stated. But I think this one needs a tiny bit of adjustment. Most modern actions and barrels will start stretching past their elasticity limits at about 100,000 psi (about 78,000 CUP) and finally start to come apart at about 120,000 psi (91,000 CUP). Some may well be stronger. Cartridge brass is weaker. It starts stretching past its elasticy limits at about 81,000 psi (about 65,000 CUP). This is the limit that's been exceeded when a fired case head extrudes back into holes or cutouts in the bolt face. When I talked with a SAAMI rep some years ago, he said it was the safety issues with cartridge brass that was their prime safety criteria for modern rifles. No doubt that some makes are stronger than others. The reason is different actions have different amounts of unsupported areas around the case head. But yes, some of the older ones didn't have as good of steel in them so their maximum peak pressure levels had to be lowered. So yes, "SAAMI puts the max pressure standard on these cases." [/QUOTE]
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260 Rem Vs. 6.5-06
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