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Rifles, Reloading, Optics, Equipment
Gunsmithing
Muzzle break threading 300 win mag
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<blockquote data-quote="Hired Gun" data-source="post: 1311949" data-attributes="member: 1290"><p>We have done near 100 .308 sporter barrels with 1/2-28 brakes if that's all that will fit. There is one well known maker of lightweight rifles that regularly installs 7/16" brake thread on their 300 RUM LW rifles. </p><p></p><p>The brake strengthens the barrel as long as you don't go cutting a thread relief on the barrel. The brake acts like an band of extra material around the threads. Just don't tighten it down real hard or it will put a choke in the bore under the threads. Test it with a tight bushing before and after the installation. </p><p>Knowing that a 500 S&W revolver barrel (shown) is only .718" major o.d. over the threads minus the thread depth can contain 60,000 psi right at the frame and is proof tested to 50% overpressure is comforting when no rifle made has 1/4 that pressure at the muzzle. Dan Wesson barrels are even thinner. </p><p> </p><p><img src="http://i645.photobucket.com/albums/uu178/cal50/Smith%20500/throatsideburred_zps906a87e6.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p> </p><p>Most importantly don't be shortening a customers barrel without consent. A 300 WM is not really a 300WM at 24". It's more like a 30-06. At 22" it's a bit more than a 308Win. Just saying if you do cut one without consent you would be expected to replace the barrel at your expense.</p></blockquote><p></p>
[QUOTE="Hired Gun, post: 1311949, member: 1290"] We have done near 100 .308 sporter barrels with 1/2-28 brakes if that's all that will fit. There is one well known maker of lightweight rifles that regularly installs 7/16" brake thread on their 300 RUM LW rifles. The brake strengthens the barrel as long as you don't go cutting a thread relief on the barrel. The brake acts like an band of extra material around the threads. Just don't tighten it down real hard or it will put a choke in the bore under the threads. Test it with a tight bushing before and after the installation. Knowing that a 500 S&W revolver barrel (shown) is only .718" major o.d. over the threads minus the thread depth can contain 60,000 psi right at the frame and is proof tested to 50% overpressure is comforting when no rifle made has 1/4 that pressure at the muzzle. Dan Wesson barrels are even thinner. [IMG]http://i645.photobucket.com/albums/uu178/cal50/Smith%20500/throatsideburred_zps906a87e6.jpg[/IMG] Most importantly don't be shortening a customers barrel without consent. A 300 WM is not really a 300WM at 24". It's more like a 30-06. At 22" it's a bit more than a 308Win. Just saying if you do cut one without consent you would be expected to replace the barrel at your expense. [/QUOTE]
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Muzzle break threading 300 win mag
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