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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
So Will the .270 Win Overtake the CM's and PRC's?
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<blockquote data-quote="rustyshackleford" data-source="post: 1947759" data-attributes="member: 59526"><p>My thinking is there is no such thing as more efficient or less efficient solely derived from case geometry. A case with greater capacity, potential energy, will almost always if not always yield higher kinetic energy at the muzzle. The easy exception to this is the operating pressure must be equal. Once it leaves the muzzle it's the design of the bullet that carries that energy more or less efficiently. I have seen efficiency tossed around so much it's only noted when it supports a claim and usually the comparison isn't honest. Case in point I just consulted the Sierra app. 284 win pushing a 150 SBT is a little faster than a 280 rem. The top level load in the 284 holds about an extra grain of powder. No discernible advantage to case design in that instance just more powder. 270 is just a hair faster than the 284 pushing a 150 with a little bit more capacity in its favor. In this comparison if accuracy was equal the 270 would have slightly more energy at the muzzle, carry it better down range, and have a little more recoil just due to physics but probably not enough to tell the 3 apart. It's just a loaded number and I really don't think it can be used to describe a cartridge. A particular projectile definitely but not a cartridge.</p></blockquote><p></p>
[QUOTE="rustyshackleford, post: 1947759, member: 59526"] My thinking is there is no such thing as more efficient or less efficient solely derived from case geometry. A case with greater capacity, potential energy, will almost always if not always yield higher kinetic energy at the muzzle. The easy exception to this is the operating pressure must be equal. Once it leaves the muzzle it’s the design of the bullet that carries that energy more or less efficiently. I have seen efficiency tossed around so much it’s only noted when it supports a claim and usually the comparison isn’t honest. Case in point I just consulted the Sierra app. 284 win pushing a 150 SBT is a little faster than a 280 rem. The top level load in the 284 holds about an extra grain of powder. No discernible advantage to case design in that instance just more powder. 270 is just a hair faster than the 284 pushing a 150 with a little bit more capacity in its favor. In this comparison if accuracy was equal the 270 would have slightly more energy at the muzzle, carry it better down range, and have a little more recoil just due to physics but probably not enough to tell the 3 apart. It’s just a loaded number and I really don’t think it can be used to describe a cartridge. A particular projectile definitely but not a cartridge. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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So Will the .270 Win Overtake the CM's and PRC's?
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