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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Which 6mm in long action Remington 700? Quality Brass is issue...
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<blockquote data-quote="Trickymissfit" data-source="post: 893382" data-attributes="member: 25383"><p>the first time I ever read that the 6mmAI was faster was from Boyd Mace, and he often shot both rounds side by side. My data says the 6mmAI everytime, but as I also said the velocity differences are nil. The gist of my post was that the 24 bore will only handle just so much powder; no matter how big and fat the case is. That's why I pointed out the two different short versions of the 6/284. I know the velocities are correct as they shot them thru my chronograph. </p><p></p><p> Back to the 85 grain bullet in the 6mm, and a couple thoughts (just about my favorite bullet size in the big six). I had little trouble doing 3350fps with standard Remington cases, and with very old .257 Roberts cases necked down (they hold about one and a half grain more water) I hit the 3400 to 3425fps mark with some very stiff loads out of a 24" barrel. Now I'd expect the 6mmAI was good for about 100fps to 125fps over the Roberts cases, so we'll just round it off at 3500fps. Yet I found my accuracy load was about fifty feet per second less (big coyote will never know the difference). This was why I spoke highly of the 6mm Vias. It's nothing but a basic 6.5x55 improved case necked down to 6mm with a slightly shortened shoulder length. Velocities are right there with the 6mmAI and the 6/284 with a smaller case volume. Looks like Ackley was right again.</p><p> </p><p> gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 893382, member: 25383"] the first time I ever read that the 6mmAI was faster was from Boyd Mace, and he often shot both rounds side by side. My data says the 6mmAI everytime, but as I also said the velocity differences are nil. The gist of my post was that the 24 bore will only handle just so much powder; no matter how big and fat the case is. That's why I pointed out the two different short versions of the 6/284. I know the velocities are correct as they shot them thru my chronograph. Back to the 85 grain bullet in the 6mm, and a couple thoughts (just about my favorite bullet size in the big six). I had little trouble doing 3350fps with standard Remington cases, and with very old .257 Roberts cases necked down (they hold about one and a half grain more water) I hit the 3400 to 3425fps mark with some very stiff loads out of a 24" barrel. Now I'd expect the 6mmAI was good for about 100fps to 125fps over the Roberts cases, so we'll just round it off at 3500fps. Yet I found my accuracy load was about fifty feet per second less (big coyote will never know the difference). This was why I spoke highly of the 6mm Vias. It's nothing but a basic 6.5x55 improved case necked down to 6mm with a slightly shortened shoulder length. Velocities are right there with the 6mmAI and the 6/284 with a smaller case volume. Looks like Ackley was right again. gary [/QUOTE]
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Which 6mm in long action Remington 700? Quality Brass is issue...
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