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Rifles, Reloading, Optics, Equipment
Reloading
Extra long bullets, 128g .257 Hammer Hunter
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<blockquote data-quote="Hugnot" data-source="post: 2602291" data-attributes="member: 115658"><p>One long pointy bullet! Be prepared for a quick twist, like 1-7.</p><p></p><p>This is the Miller Sg estimator. Note that temps are 78 degrees, 3000 fps, & Sg is 1.53. Should temps be colder or velocites be less, the estimated Sg might fall below 1.53. A Sg of 1.5 or more is recommended.</p><p></p><p>[ATTACH]388609[/ATTACH]</p><p></p><p>Very likely in addtion to having a big jump for shorter bullets should the chamber be cut for the 128's, certain lighter bullets designed for varmint shooting would blow up with the 7 twist. Seating the 128's to avoid contact with brass neck/shoulder might result in the rounds being too long to fit in magazine.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2602291, member: 115658"] One long pointy bullet! Be prepared for a quick twist, like 1-7. This is the Miller Sg estimator. Note that temps are 78 degrees, 3000 fps, & Sg is 1.53. Should temps be colder or velocites be less, the estimated Sg might fall below 1.53. A Sg of 1.5 or more is recommended. [ATTACH]388609[/ATTACH] Very likely in addtion to having a big jump for shorter bullets should the chamber be cut for the 128's, certain lighter bullets designed for varmint shooting would blow up with the 7 twist. Seating the 128's to avoid contact with brass neck/shoulder might result in the rounds being too long to fit in magazine. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Extra long bullets, 128g .257 Hammer Hunter
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