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Rifles, Reloading, Optics, Equipment
Gunsmithing
Muzzle break threading 300 win mag
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<blockquote data-quote="J E Custom" data-source="post: 1320684" data-attributes="member: 2736"><p>It is not so much the thread size, but the bore size compared to the thread size picked, and the thread fit. Torque should be no more than 30 inch/pounds.</p><p></p><p>If the thread fit is not good and the barrel tenon is to thin it can certainly compress the bore when tightened.</p><p></p><p>The barrel thread should not expand if the barrel has been properly heat treated and is not to thin that allows the tenon to expand when fired.</p><p></p><p>I recommend the largest thread size that the barrel muzzle can take and still have about 1/16'' shoulder to seat on. This is not always possible but it helps.</p><p></p><p>Thread fit and quality is very important, and thread Minor Diameter to bore thickness also. I believe that .150 minimum barrel wall thickness is ok as long as everything else is done correctly and the brake is not over torqued. </p><p></p><p>So if the proper thread size is used to give more that .150 barrel wall thickness and the barrel bore</p><p>expands, the barrel was not properly stress relieved. If the threads were not a good fit and the wall thickness was less than the recommended .150 and then it is over torqued, it could certainly reduce the bore diameter and also become subject to a catastrophic failure at worst, and effect the accuracy at best.</p><p></p><p>A "properly" installed muzzle brake has never hurt accuracy to my knowledge and in many cases improved accuracy. </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1320684, member: 2736"] It is not so much the thread size, but the bore size compared to the thread size picked, and the thread fit. Torque should be no more than 30 inch/pounds. If the thread fit is not good and the barrel tenon is to thin it can certainly compress the bore when tightened. The barrel thread should not expand if the barrel has been properly heat treated and is not to thin that allows the tenon to expand when fired. I recommend the largest thread size that the barrel muzzle can take and still have about 1/16'' shoulder to seat on. This is not always possible but it helps. Thread fit and quality is very important, and thread Minor Diameter to bore thickness also. I believe that .150 minimum barrel wall thickness is ok as long as everything else is done correctly and the brake is not over torqued. So if the proper thread size is used to give more that .150 barrel wall thickness and the barrel bore expands, the barrel was not properly stress relieved. If the threads were not a good fit and the wall thickness was less than the recommended .150 and then it is over torqued, it could certainly reduce the bore diameter and also become subject to a catastrophic failure at worst, and effect the accuracy at best. A "properly" installed muzzle brake has never hurt accuracy to my knowledge and in many cases improved accuracy. J E CUSTOM [/QUOTE]
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Muzzle break threading 300 win mag
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