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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel too small for 1/2" threadding?
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<blockquote data-quote="J E Custom" data-source="post: 1702211" data-attributes="member: 2736"><p>Yes I hear you, but there are a lot of things that are marginal and some get away with them. (Some don't). I have also seen muzzle brakes shot off, barrels split and accuracy go bad because of thread pressure and poor thread fit. So when barrel makers tell me they won't flute anything that will end up less that .137 wall because of the many different conditions placed on barrels, I start with a minimum of.150 thickness to allow for thread fit and some of the other problems that are encountered .</p><p></p><p>With certain low intensity cartridges a little less wan thickness can be tolerated. The reason that most 308 ARs are now threaded with 5/8 x 24 tpi threads was/is the failures of those with 1/2 x 28 TPI.</p><p></p><p>With the proper barrel wall thickness the thread fit and bore compression can be minimized or eliminated and the risk of shooting the brake off is also eliminated. I have also seen muzzle brakes shot in half because the bore of the brake was to small for the bullet to pass through and the bullet took the end of the brake off. (But because of proper sized threads the rest of the brake stayed intact and no harm came to the shooter.</p><p></p><p>So in my opinion, one might get away with cutting corners, but why risk it just because someone else did.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1702211, member: 2736"] Yes I hear you, but there are a lot of things that are marginal and some get away with them. (Some don't). I have also seen muzzle brakes shot off, barrels split and accuracy go bad because of thread pressure and poor thread fit. So when barrel makers tell me they won't flute anything that will end up less that .137 wall because of the many different conditions placed on barrels, I start with a minimum of.150 thickness to allow for thread fit and some of the other problems that are encountered . With certain low intensity cartridges a little less wan thickness can be tolerated. The reason that most 308 ARs are now threaded with 5/8 x 24 tpi threads was/is the failures of those with 1/2 x 28 TPI. With the proper barrel wall thickness the thread fit and bore compression can be minimized or eliminated and the risk of shooting the brake off is also eliminated. I have also seen muzzle brakes shot in half because the bore of the brake was to small for the bullet to pass through and the bullet took the end of the brake off. (But because of proper sized threads the rest of the brake stayed intact and no harm came to the shooter. So in my opinion, one might get away with cutting corners, but why risk it just because someone else did. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Barrel too small for 1/2" threadding?
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