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Long Range Hunting & Shooting
7mm lrm
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<blockquote data-quote="Ragnarnar" data-source="post: 1271311" data-attributes="member: 98218"><p>Correct me if I'm wrong,</p><p></p><p>A 7stw and 7rm both of which have 25* shoulders (iirc) are going to stretch more when fired as compared with a cartridge with a greater shoulder angle. Thus more working of the brass when it's fired, more work for me in the reloading room and ultimately less brass life. </p><p>Additionally the improvements in angle would allow a few grains in powder added. Thus more potential velocity. </p><p></p><p>I thought this was the draw to an AIed case. </p><p></p><p>I'm also of the impression that the shape of the powder charge as it sits in the case has some measure on performance, in that a short fat powder charge will be more efficient than a long skinny one. </p><p>I thought this is why the 375 ruger bests the performance of a 375 h&h in a shorter action and shorter barrel with the same amount of powder. Or the 6.5saum beating a 6.5 win mag with the same amount of powder and shorter barrel and action. And reportedly much better barrel life too. .</p></blockquote><p></p>
[QUOTE="Ragnarnar, post: 1271311, member: 98218"] Correct me if I'm wrong, A 7stw and 7rm both of which have 25* shoulders (iirc) are going to stretch more when fired as compared with a cartridge with a greater shoulder angle. Thus more working of the brass when it's fired, more work for me in the reloading room and ultimately less brass life. Additionally the improvements in angle would allow a few grains in powder added. Thus more potential velocity. I thought this was the draw to an AIed case. I'm also of the impression that the shape of the powder charge as it sits in the case has some measure on performance, in that a short fat powder charge will be more efficient than a long skinny one. I thought this is why the 375 ruger bests the performance of a 375 h&h in a shorter action and shorter barrel with the same amount of powder. Or the 6.5saum beating a 6.5 win mag with the same amount of powder and shorter barrel and action. And reportedly much better barrel life too. . [/QUOTE]
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