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Rifles, Reloading, Optics, Equipment
Reloading
Bullet runout what is the max?
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<blockquote data-quote="Bart B" data-source="post: 641598" data-attributes="member: 5302"><p>I think 30 caliber ammo with no more than 3 thousandths runout on the bullet tip is good enough as long as bullet jump to rifling is no more than a thousandth or so. Having tested ammo with such limits, some with full length sized and others with brand spankin' new unprepped cases, 1/2 MOA through 1000 yards is easy.</p><p></p><p>Note that how the cartridge is supported makes a big difference in the amount of runout there is. Especially when there's no such thing as a perfectly round case body. Rimless bottleneck cases, when fired, center in the chamber's front end at its shoulder, not anywhere on the body. Any out of round condition of the body right behind the shoulder will be reflected in bullet runout if that point's one support location. It's better to support the front of the cartridge about mid point at its shoulder. It matters little where the back of the cartridge is supported.</p><p></p><p>Note that smaller caliber in shorter cases can have about half the runout as larger caliber longer cases and both will have their bullets' axis at the same angle off the bore axis. The actual runout numbers are affected by the distance between the cartridge's resting points and the dial indicator's position on the bullet. It's easy for two different types of runout gages' setups to have a given round's numbers' twice as much on one compared to the other, which makes direct comparisons difficult.</p></blockquote><p></p>
[QUOTE="Bart B, post: 641598, member: 5302"] I think 30 caliber ammo with no more than 3 thousandths runout on the bullet tip is good enough as long as bullet jump to rifling is no more than a thousandth or so. Having tested ammo with such limits, some with full length sized and others with brand spankin' new unprepped cases, 1/2 MOA through 1000 yards is easy. Note that how the cartridge is supported makes a big difference in the amount of runout there is. Especially when there's no such thing as a perfectly round case body. Rimless bottleneck cases, when fired, center in the chamber's front end at its shoulder, not anywhere on the body. Any out of round condition of the body right behind the shoulder will be reflected in bullet runout if that point's one support location. It's better to support the front of the cartridge about mid point at its shoulder. It matters little where the back of the cartridge is supported. Note that smaller caliber in shorter cases can have about half the runout as larger caliber longer cases and both will have their bullets' axis at the same angle off the bore axis. The actual runout numbers are affected by the distance between the cartridge's resting points and the dial indicator's position on the bullet. It's easy for two different types of runout gages' setups to have a given round's numbers' twice as much on one compared to the other, which makes direct comparisons difficult. [/QUOTE]
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Bullet runout what is the max?
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