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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
best way to find the bushing size for neck dies?
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<blockquote data-quote="milanuk" data-source="post: 25991" data-attributes="member: 376"><p>I think the method I recall from Sinclairs loading hand book or some such was something like: (bullet diameter) + 2*(neckwall thickness) - ('n' thou desired neck tension). A real world example might be better. For my .308 Win, I'm using the following numbers:</p><p></p><p>.308 + 2(0.011) = 0.330</p><p></p><p>0.330 - 0.002 for neck tension = 0.328</p><p></p><p>Some people subtract a bit more for neck tension, but add in some (1-2 thou) for brass spring-back.</p><p></p><p>I normally just go w/ the numbers like I did above, and then order that one, and the size larger and the size smaller, so I have 0.327, 0.328, 0.329 bushings. Figure it's one of the less expensive loading items I have, and it's useable in any other .30 cal I have that I get a bushing die for.</p><p></p><p>YMMV,</p><p></p><p>Monte</p></blockquote><p></p>
[QUOTE="milanuk, post: 25991, member: 376"] I think the method I recall from Sinclairs loading hand book or some such was something like: (bullet diameter) + 2*(neckwall thickness) - ('n' thou desired neck tension). A real world example might be better. For my .308 Win, I'm using the following numbers: .308 + 2(0.011) = 0.330 0.330 - 0.002 for neck tension = 0.328 Some people subtract a bit more for neck tension, but add in some (1-2 thou) for brass spring-back. I normally just go w/ the numbers like I did above, and then order that one, and the size larger and the size smaller, so I have 0.327, 0.328, 0.329 bushings. Figure it's one of the less expensive loading items I have, and it's useable in any other .30 cal I have that I get a bushing die for. YMMV, Monte [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
best way to find the bushing size for neck dies?
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