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Rifles, Reloading, Optics, Equipment
Reloading
Bullet seating depth help
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<blockquote data-quote="entoptics" data-source="post: 1806747" data-attributes="member: 104268"><p>1) Manuals are a guideline that tries to get "close" for "everything", which means they're usually "right" for "nothing".</p><p></p><p>2) One caliber neck grip is also a guideline. For example, the 300 WM only has a SAAMI spec of 0.264 neck, so one caliber isn't even an option. The 270 Win is like a giraffe, with an absurdly long 0.384 neck length (waste of perfectly good case volume IMO).</p><p></p><p>In your case, with a really short bullet like the V-Max, the manual is probably pretty close, but there's no hard and fast rule for neck tension.</p><p></p><p>1) Don't seat with the ogive below the case mouth. If you don't have a bullet comparator, you can test by sticking a loaded round into the muzzle, and if the brass touches, you're too deep.</p><p></p><p>2) As long as there's sufficient grip on the bullet to keep it in the case, the greater than one caliber neck grip is a goal, not a rule. I think 2/3 caliber is sufficient, if not ideal. You can measure bearing surface with a comparator, or as above, stick a bullet into the end of the barrel, and measure how much is left sticking out. That will be pretty close to your bearing surface. For boat tailed bullets, you can stick it in one direction and mark, then reverse and mark, then measure between marks.</p><p></p><p>As long as it shoots OK, and you can't push/pull the bullet out of place easily, you're fine.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1806747, member: 104268"] 1) Manuals are a guideline that tries to get "close" for "everything", which means they're usually "right" for "nothing". 2) One caliber neck grip is also a guideline. For example, the 300 WM only has a SAAMI spec of 0.264 neck, so one caliber isn't even an option. The 270 Win is like a giraffe, with an absurdly long 0.384 neck length (waste of perfectly good case volume IMO). In your case, with a really short bullet like the V-Max, the manual is probably pretty close, but there's no hard and fast rule for neck tension. 1) Don't seat with the ogive below the case mouth. If you don't have a bullet comparator, you can test by sticking a loaded round into the muzzle, and if the brass touches, you're too deep. 2) As long as there's sufficient grip on the bullet to keep it in the case, the greater than one caliber neck grip is a goal, not a rule. I think 2/3 caliber is sufficient, if not ideal. You can measure bearing surface with a comparator, or as above, stick a bullet into the end of the barrel, and measure how much is left sticking out. That will be pretty close to your bearing surface. For boat tailed bullets, you can stick it in one direction and mark, then reverse and mark, then measure between marks. As long as it shoots OK, and you can't push/pull the bullet out of place easily, you're fine. [/QUOTE]
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Bullet seating depth help
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