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Rifles, Reloading, Optics, Equipment
Gunsmithing
Thoughts from the pro's
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<blockquote data-quote="Gcan" data-source="post: 1624781" data-attributes="member: 102867"><p>I have done actions where I did not recut the threads larger but only using original barrels which are seldom class 3 threaded. Thats a whole other discussion.</p><p></p><p>I wouldn't "build" a gun on an OEM action and new barrel without recutting action threads.</p><p></p><p>As far as pre cut barrels go, you can buy a barrel threaded to any oversize thread. Its just a number. You can order a class 3a tenon thread to match your oversized 3b action thread. This would be covered in the term "Blueprinting".</p><p></p><p>When we re cut an action we produce a print of all the critical dimensions for that action.</p><p></p><p>An oversized action thread is usually cut using a +.010" 3a (male) go/no go gauge. Once cut, you can use that info to order a barrel. Unless you order a short chamber and finish ream for headspacing pre fit (chambered) barrels are a coin toss. However, theoretically Remington factory actions and barrels are cut to allow swaps but I'm a headspace snob and not a fan of pre-fit (chambers) barrels headspacing correctly. Never screw a barrel on to an action without gauges. Notwithstanding using a Remage/savage/Ruger system where u just use go/no go chamber gauges and tighten a barrel nut.</p></blockquote><p></p>
[QUOTE="Gcan, post: 1624781, member: 102867"] I have done actions where I did not recut the threads larger but only using original barrels which are seldom class 3 threaded. Thats a whole other discussion. I wouldn’t “build” a gun on an OEM action and new barrel without recutting action threads. As far as pre cut barrels go, you can buy a barrel threaded to any oversize thread. Its just a number. You can order a class 3a tenon thread to match your oversized 3b action thread. This would be covered in the term “Blueprinting”. When we re cut an action we produce a print of all the critical dimensions for that action. An oversized action thread is usually cut using a +.010” 3a (male) go/no go gauge. Once cut, you can use that info to order a barrel. Unless you order a short chamber and finish ream for headspacing pre fit (chambered) barrels are a coin toss. However, theoretically Remington factory actions and barrels are cut to allow swaps but I’m a headspace snob and not a fan of pre-fit (chambers) barrels headspacing correctly. Never screw a barrel on to an action without gauges. Notwithstanding using a Remage/savage/Ruger system where u just use go/no go chamber gauges and tighten a barrel nut. [/QUOTE]
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