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<blockquote data-quote="SDMF" data-source="post: 476875" data-attributes="member: 412">Possibly, just have to look up capacity of each.&nbsp; Barnsness has gone through the rudimentary 4:1 ratio of capacity vs. velocity many time in ‘Campfire and it’s also in at least 1 of his “Gun Gack” books.&nbsp; Basically whatever percentage you add in capacity, you’ll add 25% of that to velocity.&nbsp; So, if you add 10% more capacity you’ll reap ~2.5% more velocity.If you have a loaded round that provides 3000fps and you add 10% more powder capacity with a modified or new case, and the pressure is constant between the 2 rounds, you’re new velocity will be roughly 3075FPS, or a 2.5% gain over 3K FPS.&nbsp; It’s a “rule of thumb” to get you in the ball park, not a law of physics.I did 7WSM because @ the time, the 162A-Max was the best balance of BC/Velocity I could piece together and I had a short single shot action to build on.&nbsp; The 7 has the most capacity if the WSM’s due to the shoulder being further forward to preclude the 7 from being chambered in a 270WSM rifle.&nbsp; Just like the 280rem/270Win.</blockquote>

[QUOTE="SDMF, post: 476875, member: 412"] Possibly, just have to look up capacity of each. Barnsness has gone through the rudimentary 4:1 ratio of capacity vs. velocity many time in ‘Campfire and it’s also in at least 1 of his “Gun Gack” books. Basically whatever percentage you add in capacity, you’ll add 25% of that to velocity. So, if you add 10% more capacity you’ll reap ~2.5% more velocity. If you have a loaded round that provides 3000fps and you add 10% more powder capacity with a modified or new case, and the pressure is constant between the 2 rounds, you’re new velocity will be roughly 3075FPS, or a 2.5% gain over 3K FPS. It’s a “rule of thumb” to get you in the ball park, not a law of physics. I did 7WSM because @ the time, the 162A-Max was the best balance of BC/Velocity I could piece together and I had a short single shot action to build on. The 7 has the most capacity if the WSM’s due to the shoulder being further forward to preclude the 7 from being chambered in a 270WSM rifle. Just like the 280rem/270Win. [/QUOTE]

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