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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Understanding cartridge efficiency
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<blockquote data-quote="Mikecr" data-source="post: 1915013" data-attributes="member: 1521"><p><strong>This is right</strong>.</p><p></p><p>If you were to neck up a 25wssm case to 30cal, and nothing else, it would match a 308 in capacity, and it would produce higher velocities with the same loads and barrel lengths. I guarantee it.</p><p>WSSM can be THE example of short/fat efficiency, and this attribute is adjusted with 'weighting factor' in QuickLoad.</p><p><strong>Weighting factor</strong> is a setting designating ability to burn powder in the case -vs- half way down the barrel. </p><p>Inefficient cartridges produce and project a powder slug on the back of bullets, delaying/preventing burn, and adding to recoil.</p><p>A 30-06 being pretty much worst about this, a 30wssm would be among the best (for 30cal & with 30BR).</p><p></p><p>For calibration of proposed 30wssm, weighting factor WILL have to be adjusted, and with no other changes QuickLoad's output MV will go up, and muzzle pressure will go down. I had to do this with a 26wssm IMP to calibrate. It is is more efficient than any 26cal cartridge in production.</p><p>Ackley improved cartridges are designed to hold back the powder. It would be appropriate to adjust QL weighting factor for them. But AI is also applied to cartridges that would not be very efficient even with it. The benefit there is a little better reloading life. A 30-06AI would not benefit much from the efforts.</p><p></p><p>The price for short/fat design is that you need to design the gun for it. If you don't, the effort will cause problems and fail w/resp to gains. From what I saw with it, Savage was the first gunbuilder to understand this. Winchester and Browning were not, and Remington never would get it..</p><p>I would recommend a Savage WSM or WSSM gun action to begin a project with that case.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1915013, member: 1521"] [B]This is right[/B]. If you were to neck up a 25wssm case to 30cal, and nothing else, it would match a 308 in capacity, and it would produce higher velocities with the same loads and barrel lengths. I guarantee it. WSSM can be THE example of short/fat efficiency, and this attribute is adjusted with 'weighting factor' in QuickLoad. [B]Weighting factor[/B] is a setting designating ability to burn powder in the case -vs- half way down the barrel. Inefficient cartridges produce and project a powder slug on the back of bullets, delaying/preventing burn, and adding to recoil. A 30-06 being pretty much worst about this, a 30wssm would be among the best (for 30cal & with 30BR). For calibration of proposed 30wssm, weighting factor WILL have to be adjusted, and with no other changes QuickLoad's output MV will go up, and muzzle pressure will go down. I had to do this with a 26wssm IMP to calibrate. It is is more efficient than any 26cal cartridge in production. Ackley improved cartridges are designed to hold back the powder. It would be appropriate to adjust QL weighting factor for them. But AI is also applied to cartridges that would not be very efficient even with it. The benefit there is a little better reloading life. A 30-06AI would not benefit much from the efforts. The price for short/fat design is that you need to design the gun for it. If you don't, the effort will cause problems and fail w/resp to gains. From what I saw with it, Savage was the first gunbuilder to understand this. Winchester and Browning were not, and Remington never would get it.. I would recommend a Savage WSM or WSSM gun action to begin a project with that case. [/QUOTE]
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