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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel too small for 1/2" threadding?
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<blockquote data-quote="cohunt" data-source="post: 1704402" data-attributes="member: 94491"><p>I found some info online about muzzle pressures--of course this is different depending on what bullet weight, powder burn rate, barrel length, etc--but it is a generalization of information to chew on: in a magnum cartridge, the muzzle pressure would be in the neighborhood of 18000psi, but with an 30-06 it would be around 10,000 so clearly there is a large difference in muzzle pressure and therefore a difference in "safety factor" when trying to figure out if 7/16" threads would be safe for a .308 bore rifle</p><p></p><p>if you use your metallurgy numbers of minimum wall thickness for 50,000psi=.123", and 60000=.148"--then for 10000psi it would only be .025" so in effect, .308+.025"+.025"=.358"-- the minor diameter of a male 7/16" thread is .3949" so technically it would be safe for 308w or 30-06 but for magnums with a muzzle pressure of 18000ish you would need around .045" minimum--which is the minor diameter of unef 1/2" threads</p></blockquote><p></p>
[QUOTE="cohunt, post: 1704402, member: 94491"] I found some info online about muzzle pressures--of course this is different depending on what bullet weight, powder burn rate, barrel length, etc--but it is a generalization of information to chew on: in a magnum cartridge, the muzzle pressure would be in the neighborhood of 18000psi, but with an 30-06 it would be around 10,000 so clearly there is a large difference in muzzle pressure and therefore a difference in "safety factor" when trying to figure out if 7/16" threads would be safe for a .308 bore rifle if you use your metallurgy numbers of minimum wall thickness for 50,000psi=.123", and 60000=.148"--then for 10000psi it would only be .025" so in effect, .308+.025"+.025"=.358"-- the minor diameter of a male 7/16" thread is .3949" so technically it would be safe for 308w or 30-06 but for magnums with a muzzle pressure of 18000ish you would need around .045" minimum--which is the minor diameter of unef 1/2" threads [/QUOTE]
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Gunsmithing
Barrel too small for 1/2" threadding?
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