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Rifles, Reloading, Optics, Equipment
Reloading
6.5 CM COAL HELP
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<blockquote data-quote="GrayCreed" data-source="post: 2194705" data-attributes="member: 114633"><p>You don't see data for that because the Book writters don't want to get sued buy people shooting AR10s (they are limited to 2.800"). At 2.875 you can fit more powder too(I've shot up to 42.9g of h4350)(don't do that unless you go very slow and know what you are doing)(at your own risk) </p><p></p><p>How far am I off the lands at 2.875"? I don't know! Somewhere between .009 and .050.... Small groups matter more than how the lands feel about what you are doing. Know where the lands are when you start but adjust in the direction the group gets smaller. There are other things that affect accuracy such as barrel time/note and powder/primer relationship and powder fill %. I would worry about having quality brass too. Do a staterlee ladder at 2.870 and find where your powder likes to be. Then shoot 2-3 groups in the middle of the best flat spot. If the velocity/SD/ES is good but the group is not move further from the lands in .005" increments. If you find a good group but velocity consistency has fallen apart move the powder charge lower in 0.2g increments (keeping COAL the same)untill velocity consistency comes back</p><p></p><p></p><p>Joel</p></blockquote><p></p>
[QUOTE="GrayCreed, post: 2194705, member: 114633"] You don't see data for that because the Book writters don't want to get sued buy people shooting AR10s (they are limited to 2.800"). At 2.875 you can fit more powder too(I've shot up to 42.9g of h4350)(don't do that unless you go very slow and know what you are doing)(at your own risk) How far am I off the lands at 2.875"? I don't know! Somewhere between .009 and .050.... Small groups matter more than how the lands feel about what you are doing. Know where the lands are when you start but adjust in the direction the group gets smaller. There are other things that affect accuracy such as barrel time/note and powder/primer relationship and powder fill %. I would worry about having quality brass too. Do a staterlee ladder at 2.870 and find where your powder likes to be. Then shoot 2-3 groups in the middle of the best flat spot. If the velocity/SD/ES is good but the group is not move further from the lands in .005" increments. If you find a good group but velocity consistency has fallen apart move the powder charge lower in 0.2g increments (keeping COAL the same)untill velocity consistency comes back Joel [/QUOTE]
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6.5 CM COAL HELP
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