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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: 1703370" data-attributes="member: 94491"><p>It comes down to strength of the barrel, when you take 7/16" --.4375" ( which is actually the outside of the threads not inside /minor thread diam) then subtract the groove diameter of .308 it equals .1295-- then devide it by 2 (as the barrel has 2 sides to it) --- that equals .06475</p><p></p><p>Some people think this is too thin for safety to contain the pressures of the caliber/cartridge. 308 runs anywhere from 50000-65000 depending on cartridge--- but as I stated about that is peak pressure (which occurs about 3/4" down the barrel, not at the muzzle.</p><p>But- it has been proven that small thread diameters can make the inside of the bore diameter smaller from machining, and the outside of the muzzle can swell from pressure.</p><p></p><p>I would love to see documented data on the kimber mountain ascent rifles in 300wsm and 300wm as they use 7/16" threads, I have not heard of any issues-sans some accuracy problems- which I wonder if they are muzzle swelling related, or lightweight rifle issues, I hear they can have other issues like mag box bind and finicky on action screw torque also.</p><p></p><p>All in all it's kind of like barrel break in and cleaning topics.</p><p></p><p>My question wasnt about the bore diameter vs thread diameter as I know it's a "touchy" subject--- it was more about if there would be enough of a shoulder to properly mount a muzzle brake on-- not even a suppressor as i know that's a whole other topic also.</p><p></p><p>I have a .650" barrel threaded for 9/16 so that would make me think a .555" barrel would be ok for 1/2" threadding -- my local smith told me it had to be 7/16" so I was trying to figure out why.</p></blockquote><p></p>
[QUOTE="cohunt, post: 1703370, member: 94491"] It comes down to strength of the barrel, when you take 7/16" --.4375" ( which is actually the outside of the threads not inside /minor thread diam) then subtract the groove diameter of .308 it equals .1295-- then devide it by 2 (as the barrel has 2 sides to it) --- that equals .06475 Some people think this is too thin for safety to contain the pressures of the caliber/cartridge. 308 runs anywhere from 50000-65000 depending on cartridge--- but as I stated about that is peak pressure (which occurs about 3/4" down the barrel, not at the muzzle. But- it has been proven that small thread diameters can make the inside of the bore diameter smaller from machining, and the outside of the muzzle can swell from pressure. I would love to see documented data on the kimber mountain ascent rifles in 300wsm and 300wm as they use 7/16" threads, I have not heard of any issues-sans some accuracy problems- which I wonder if they are muzzle swelling related, or lightweight rifle issues, I hear they can have other issues like mag box bind and finicky on action screw torque also. All in all it's kind of like barrel break in and cleaning topics. My question wasnt about the bore diameter vs thread diameter as I know it's a "touchy" subject--- it was more about if there would be enough of a shoulder to properly mount a muzzle brake on-- not even a suppressor as i know that's a whole other topic also. I have a .650" barrel threaded for 9/16 so that would make me think a .555" barrel would be ok for 1/2" threadding -- my local smith told me it had to be 7/16" so I was trying to figure out why. [/QUOTE]
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Barrel too small for 1/2" threadding?
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