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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7MM RUM/WC872 and the chrony ...
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<blockquote data-quote="Mark_in_utah" data-source="post: 27413" data-attributes="member: 1503"><p>DWM,</p><p></p><p>You're in the realm of VERY small load changes. While 0.5 grains SEEMS like a lot, it's about 1/2% load change. 1/2 a grain in smaller calibers is more like a full 1% load change. You're also into the load efficiency thing, where the powder is less efficient at pushing the bullet down the barrel. </p><p></p><p>I agree with what was said, you can't expect the velocity to change much with 1/2 grain load change in this cartridge. I've seen the same thing in my .338 RUM, and I'm just starting my load development with it.</p><p></p><p>Mark in Utah</p></blockquote><p></p>
[QUOTE="Mark_in_utah, post: 27413, member: 1503"] DWM, You're in the realm of VERY small load changes. While 0.5 grains SEEMS like a lot, it's about 1/2% load change. 1/2 a grain in smaller calibers is more like a full 1% load change. You're also into the load efficiency thing, where the powder is less efficient at pushing the bullet down the barrel. I agree with what was said, you can't expect the velocity to change much with 1/2 grain load change in this cartridge. I've seen the same thing in my .338 RUM, and I'm just starting my load development with it. Mark in Utah [/QUOTE]
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7MM RUM/WC872 and the chrony ...
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