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Long Range Hunting & Shooting
Powder max on .270 Winchester
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<blockquote data-quote="entoptics" data-source="post: 1726860" data-attributes="member: 104268"><p>Of course all rifles are different, but that seems like a pretty stout charge of H4831. Just checked online (Nosler/Hodgden), and the max charge for a 140 gr bullet is 58.0, and 150 gr is 55.7. The test barrels were 24", and they were getting around 2800-2900 fps with the 150s, and 2900-3000 with the 140s.</p><p></p><p>Guess what I'm getting at, is your substantially exceeding 140 grain 24" results and powder charges with a 145 gr in a 22" barrel.</p><p></p><p>As mentioned, all rifles are different, so you may be fine, but I'd proceed with caution. When you're running at the upper end, a change in temp, neck tension, etc might cause you to rapidly rise into the "harmful" territory.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1726860, member: 104268"] Of course all rifles are different, but that seems like a pretty stout charge of H4831. Just checked online (Nosler/Hodgden), and the max charge for a 140 gr bullet is 58.0, and 150 gr is 55.7. The test barrels were 24", and they were getting around 2800-2900 fps with the 150s, and 2900-3000 with the 140s. Guess what I'm getting at, is your substantially exceeding 140 grain 24" results and powder charges with a 145 gr in a 22" barrel. As mentioned, all rifles are different, so you may be fine, but I'd proceed with caution. When you're running at the upper end, a change in temp, neck tension, etc might cause you to rapidly rise into the "harmful" territory. [/QUOTE]
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Powder max on .270 Winchester
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