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Rifles, Reloading, Optics, Equipment
Gunsmithing
Brake installation question.
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<blockquote data-quote="tobnpr" data-source="post: 2523719" data-attributes="member: 68758"><p>There's two primary considerations.</p><p>Barrel wall thickness which Boe mentioned. This is what's "left" of the barrel beyond the thread minor diameter to the bore.</p><p>It's not enough to just consider the major diameter of the thread tenon and barrel OD for the mating shoulder. Big difference in wall thickness between a 6mm and 30 cal bore and any given pitch diameter.</p><p></p><p>There's no hard and fast rule, every smith has their own comfort level. "Bell mouth" can indeed happen.</p><p>You'll find at least a handful of manufacturers that thread skinny muzzle hunting barrels in .300 WM in 1/2"-28.</p><p>I've done that, but reluctantly. How the threads are cut, and the correct root threadform is critical to minimize this happening.</p><p></p><p>With 9/16"-24 there's just over .100 barrel wall thickness with a .308 groove diameter which I'm perfectly fine with. Others may feel differently.</p><p></p><p>Even in circumstances where there's inadequate barrels shoulder, it's simple enough to use (or modify) a brake that indexes off the muzzle instead of a torque shoulder.</p></blockquote><p></p>
[QUOTE="tobnpr, post: 2523719, member: 68758"] There's two primary considerations. Barrel wall thickness which Boe mentioned. This is what's "left" of the barrel beyond the thread minor diameter to the bore. It's not enough to just consider the major diameter of the thread tenon and barrel OD for the mating shoulder. Big difference in wall thickness between a 6mm and 30 cal bore and any given pitch diameter. There's no hard and fast rule, every smith has their own comfort level. "Bell mouth" can indeed happen. You'll find at least a handful of manufacturers that thread skinny muzzle hunting barrels in .300 WM in 1/2"-28. I've done that, but reluctantly. How the threads are cut, and the correct root threadform is critical to minimize this happening. With 9/16"-24 there's just over .100 barrel wall thickness with a .308 groove diameter which I'm perfectly fine with. Others may feel differently. Even in circumstances where there's inadequate barrels shoulder, it's simple enough to use (or modify) a brake that indexes off the muzzle instead of a torque shoulder. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Brake installation question.
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