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Long Range Hunting & Shooting
Best LR .30 caliber on .473 bolt face
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<blockquote data-quote="TRexF16" data-source="post: 2029176" data-attributes="member: 108912"><p>Yes, but for a given pressure level, a 9% increase in case volume will not gain 4% in velocity, it will only gain about 2.25% in velocity (25% of the increase in volume). This is just the physics of how cartridges behave.</p><p>In Feenix's question above, first, we must recognize a 30-06 will easily do 3000 FPS at 60K PSI, not 2900 FPS.</p><p>And if the Gibbs achieved 3285 FPS (which I completely believe it did), it did not do so at 60K PSI. More likely it was closer to .270 Win territory of 65K PSI, which again, I contend was probably perfectly safe. But if the 30-06 basic case had been loaded to the same pressure level with the same powder and bullet (not the same powder <em>charge</em>, it would have been a lower charge to get the same pressure in the smaller case), it would have likely produced somewhere north of 3100 FPS. [EDIT - and I should add, probably just as safely as the Gibbs went north of 3200 FPS - that's kind of my point - the gains noted for "improved" cartridges are mostly achieve by increased pressure, and I write this as an improved fan]</p><p></p><p>Regards,</p><p>Rex</p></blockquote><p></p>
[QUOTE="TRexF16, post: 2029176, member: 108912"] Yes, but for a given pressure level, a 9% increase in case volume will not gain 4% in velocity, it will only gain about 2.25% in velocity (25% of the increase in volume). This is just the physics of how cartridges behave. In Feenix's question above, first, we must recognize a 30-06 will easily do 3000 FPS at 60K PSI, not 2900 FPS. And if the Gibbs achieved 3285 FPS (which I completely believe it did), it did not do so at 60K PSI. More likely it was closer to .270 Win territory of 65K PSI, which again, I contend was probably perfectly safe. But if the 30-06 basic case had been loaded to the same pressure level with the same powder and bullet (not the same powder [I]charge[/I], it would have been a lower charge to get the same pressure in the smaller case), it would have likely produced somewhere north of 3100 FPS. [EDIT - and I should add, probably just as safely as the Gibbs went north of 3200 FPS - that's kind of my point - the gains noted for "improved" cartridges are mostly achieve by increased pressure, and I write this as an improved fan] Regards, Rex [/QUOTE]
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Best LR .30 caliber on .473 bolt face
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