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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
School me on case design..
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<blockquote data-quote="Kevin Thomas" data-source="post: 618073" data-attributes="member: 15748"><p>1tonpower,</p><p> </p><p>It really depends on what you're wanting to compare here. In terms of velocity, it's really a pretty simple equation; more capacity equals more velocity, all other variables being equal. Those variables are where the rubs come in. If we assume the same barrel length and the same pressures, the larger case will deliver better velocity, although they may do so at a level of diminished efficiency. In other words, you'll start getting less energy "out" in relation to the energy you put "in" straight across the board. Can you get higher velocities out of a smaller cartridge than you do out of a bigger cartridge, all other variables remaining equal? Sure, but you have to go to higher pressures to do so. Again, it comes down to shuffling variables and changing the equation.</p><p> </p><p>Accuracy is another matter, and one in which there is at least a fairly constant trend; smaller is better. Bart mentioned the short/fat concept, and this definately plays into it, but case capacity is a real indicator over long run averages. To put it bluntly, a 300 Win Mag is more accurate than a 300 RUM or 300 Wby Mag, a 30-06 is more accurate than a 300 Win Mag, and a 308 Win is more accurate than a 30-06, and a 30 BR is more accurate than a 308 Win.. Improtant to note that we're talking averages here, not inidividual rifles. The NRA HighPower series they did several years back had an excellent write-up on the average accuracy of Remington 40-Xs from their Custom Shop, with accuracy averages in a variety of chamberings. All identical guns, same make of barrel, same action, everything, and an average of hundreds of different guns over a period of several years. There was a direct (and inverse) linear relationship between case capacity and accuracy. Now, that said, you still need to match the cartridge to the job at hand. If I'm building a 30 caliber gun for 1000 yard competition, it's probably going to be a 300 Win Mag, not a 30 BR, if you get my drift.</p><p> </p><p>Don't let these design features or attributes blind you to what the ultimate purpose of the gun is to be. They all have their place, and they're all something of a trade-off between positives and negatives.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 618073, member: 15748"] 1tonpower, It really depends on what you're wanting to compare here. In terms of velocity, it's really a pretty simple equation; more capacity equals more velocity, all other variables being equal. Those variables are where the rubs come in. If we assume the same barrel length and the same pressures, the larger case will deliver better velocity, although they may do so at a level of diminished efficiency. In other words, you'll start getting less energy "out" in relation to the energy you put "in" straight across the board. Can you get higher velocities out of a smaller cartridge than you do out of a bigger cartridge, all other variables remaining equal? Sure, but you have to go to higher pressures to do so. Again, it comes down to shuffling variables and changing the equation. Accuracy is another matter, and one in which there is at least a fairly constant trend; smaller is better. Bart mentioned the short/fat concept, and this definately plays into it, but case capacity is a real indicator over long run averages. To put it bluntly, a 300 Win Mag is more accurate than a 300 RUM or 300 Wby Mag, a 30-06 is more accurate than a 300 Win Mag, and a 308 Win is more accurate than a 30-06, and a 30 BR is more accurate than a 308 Win.. Improtant to note that we're talking averages here, not inidividual rifles. The NRA HighPower series they did several years back had an excellent write-up on the average accuracy of Remington 40-Xs from their Custom Shop, with accuracy averages in a variety of chamberings. All identical guns, same make of barrel, same action, everything, and an average of hundreds of different guns over a period of several years. There was a direct (and inverse) linear relationship between case capacity and accuracy. Now, that said, you still need to match the cartridge to the job at hand. If I'm building a 30 caliber gun for 1000 yard competition, it's probably going to be a 300 Win Mag, not a 30 BR, if you get my drift. Don't let these design features or attributes blind you to what the ultimate purpose of the gun is to be. They all have their place, and they're all something of a trade-off between positives and negatives. [/QUOTE]
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School me on case design..
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