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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
If you could design a cartridge from scratch
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<blockquote data-quote="Maol" data-source="post: 2852184" data-attributes="member: 98340"><p>No worries, it's easily explained. The .270 Winchester, the .270 Weatherby Magnum and .270 WSM all use a 1:10-inch twist rate, which won't stabilize most bullets heavier than 150 grains. Instead by using a 1:8-inch and 1:7.5-inch twist rate, a slightly shortened .270 WSM case allows the use of longer, sleeker heavier bullets in a short-action, same as the 270 WSM, but it's optimized case stabilizes 165, 170, and 175 grain .277 bullets driven at respectable velocities. The higher BC makes up for the small sacrifice in capacity allowing for longer range, and the better SD of all three heavier weights gives better results on game than the 150 gr 277. No suspension of disbelief required.</p></blockquote><p></p>
[QUOTE="Maol, post: 2852184, member: 98340"] No worries, it's easily explained. The .270 Winchester, the .270 Weatherby Magnum and .270 WSM all use a 1:10-inch twist rate, which won't stabilize most bullets heavier than 150 grains. Instead by using a 1:8-inch and 1:7.5-inch twist rate, a slightly shortened .270 WSM case allows the use of longer, sleeker heavier bullets in a short-action, same as the 270 WSM, but it's optimized case stabilizes 165, 170, and 175 grain .277 bullets driven at respectable velocities. The higher BC makes up for the small sacrifice in capacity allowing for longer range, and the better SD of all three heavier weights gives better results on game than the 150 gr 277. No suspension of disbelief required. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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If you could design a cartridge from scratch
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