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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger 245 EOL Best Cartridge
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<blockquote data-quote="jpndave" data-source="post: 2375049" data-attributes="member: 5437"><p>The standard Ackley treatment is to minimize wall taper and blow the shoulder forward to 40°. The base of the neck is usually set tight on the parent cartridge so they fire form in place better - it headspaces on the base of the neck.</p><p></p><p>That 30 SM is less wall taper and 40° instead of 30° like the original PRC. Those two things give more case volume and usually less stretch to the case. It also masks pressure since the case doesn't get pushed as hard back. The bolt itself doesn't see the pressure either so arguably more pressure would be easier on the lugs too with that design. The barrel and chamber still see the increased pressure though they are usually fine to much higher levels. With top quality brass the increased pressure is probably ok but it's still there.</p></blockquote><p></p>
[QUOTE="jpndave, post: 2375049, member: 5437"] The standard Ackley treatment is to minimize wall taper and blow the shoulder forward to 40°. The base of the neck is usually set tight on the parent cartridge so they fire form in place better - it headspaces on the base of the neck. That 30 SM is less wall taper and 40° instead of 30° like the original PRC. Those two things give more case volume and usually less stretch to the case. It also masks pressure since the case doesn't get pushed as hard back. The bolt itself doesn't see the pressure either so arguably more pressure would be easier on the lugs too with that design. The barrel and chamber still see the increased pressure though they are usually fine to much higher levels. With top quality brass the increased pressure is probably ok but it's still there. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger 245 EOL Best Cartridge
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