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<blockquote data-quote="Timnterra" data-source="post: 1516889" data-attributes="member: 55944"><p>I only hear good things about all the Sherman cartridges and I am going to eventually try one, probably the 6.5 sherman. With that said I don't see how it is physically possible to push the same bullet at faster speeds using less powder and not have higher pressures. This claim defies the laws of physics. This was George Gardiners premise while developing on the Gap4s; a larger case capacity shooting more slower burning powder can achieve the same velocity with lower pressures. This lowered pressure is how it is supposed to be able to achieve longer barrel life. I know neck length has something to do with barrel life and that is probably why the 6.5-284 is hard on barrels. For what it's worth, while loading for my 6.5saum I've had pressure signs at only 2850 FPS. The barrel is only 18", not what the saum is designed for.</p></blockquote><p></p>
[QUOTE="Timnterra, post: 1516889, member: 55944"] I only hear good things about all the Sherman cartridges and I am going to eventually try one, probably the 6.5 sherman. With that said I don’t see how it is physically possible to push the same bullet at faster speeds using less powder and not have higher pressures. This claim defies the laws of physics. This was George Gardiners premise while developing on the Gap4s; a larger case capacity shooting more slower burning powder can achieve the same velocity with lower pressures. This lowered pressure is how it is supposed to be able to achieve longer barrel life. I know neck length has something to do with barrel life and that is probably why the 6.5-284 is hard on barrels. For what it’s worth, while loading for my 6.5saum I’ve had pressure signs at only 2850 FPS. The barrel is only 18”, not what the saum is designed for. [/QUOTE]
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