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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Understanding cartridge efficiency
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<blockquote data-quote="Wild_Bill" data-source="post: 1915202" data-attributes="member: 4785"><p>Hi a close example would be a 243 Win and 243WSSM.</p><p>I have loaded both with the same projectile and same charge of H4350 and in 24" barrels they had the same velocity.</p><p></p><p>The difference in factory ammo is the pressure that they are loaded to.</p><p>Also the difference although minor is basically 1/2" of barrel length.</p><p>As the WSSM case is fairly close in capacity it is shorter so having a 24" barrel on both the WSSM essentially has more combustion.area if you me a sure from the front of the chamber to the muzzle.</p><p></p><p>Some cartriges are more efficient take a 6mm Dasher it will get close to a 243 however that is due to the pressure.</p><p>And the last thing is to gain 200fps over 3000fps takes x powder increase but to gain another 200fps might take 3 or 4 times x in slower powder.</p></blockquote><p></p>
[QUOTE="Wild_Bill, post: 1915202, member: 4785"] Hi a close example would be a 243 Win and 243WSSM. I have loaded both with the same projectile and same charge of H4350 and in 24" barrels they had the same velocity. The difference in factory ammo is the pressure that they are loaded to. Also the difference although minor is basically 1/2" of barrel length. As the WSSM case is fairly close in capacity it is shorter so having a 24" barrel on both the WSSM essentially has more combustion.area if you me a sure from the front of the chamber to the muzzle. Some cartriges are more efficient take a 6mm Dasher it will get close to a 243 however that is due to the pressure. And the last thing is to gain 200fps over 3000fps takes x powder increase but to gain another 200fps might take 3 or 4 times x in slower powder. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Understanding cartridge efficiency
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