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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: 1624802" data-attributes="member: 102867"><p>Yes. </p><p></p><p>Grinding is for sure better. However most thread grinders are set up to grind between centers or full production models can work thru auto collets. They don't lend themselves to four jaw/spider sets. If you find a thread grinder that will accept 36" between centers it costs a phone number. </p><p>And if you have say a hardinge type tool lathe u can make a very nice thread grinder. </p><p>The thing bout barrels is we are not making gyros or shuttle parts or working to .00005". I know this is sacrilege but we are building guns. Point Cutting threads is fine. </p><p></p><p>There is a point where we are chasing accuracy to inflate prices. At some point enough is perfect. </p><p></p><p>Case in point. </p><p></p><p>This is a load test on a recent build for a nephew. 22-250. I did everything but action thread on his 700 sa because he had a new rem LV barrel. I set the chamber back a bit and rechambered with a manson reamer. Extended the factory tenon thread. Used a ptg .300 lug. Glass bedded it in an old HS Precision stock I had. While I know everything on the action was legit within a few thenths, the barrel and action threads were class 2 at best. Probably worse. </p><p></p><p>[ATTACH=full]132048[/ATTACH]</p><p></p><p>These groups were all shot off a bipod. Get a gun concentric and it will have low harmonics and shoot everything to same spot. The bottom right group was a load for another 22-250 we built. The question is simply, how much is enough? No shooter will ever out shoot or shoot better than this gun. And I would not call it a $$$$ build. So yes, we can chase tolerances to an extreme but unless you are shooting bench matches, and even then, the tolerances a lot of people tout are seldom realized or necessary. The trick is knowing where tolerance is critical.</p></blockquote><p></p>
[QUOTE="Gcan, post: 1624802, member: 102867"] Yes. Grinding is for sure better. However most thread grinders are set up to grind between centers or full production models can work thru auto collets. They don’t lend themselves to four jaw/spider sets. If you find a thread grinder that will accept 36” between centers it costs a phone number. And if you have say a hardinge type tool lathe u can make a very nice thread grinder. The thing bout barrels is we are not making gyros or shuttle parts or working to .00005”. I know this is sacrilege but we are building guns. Point Cutting threads is fine. There is a point where we are chasing accuracy to inflate prices. At some point enough is perfect. Case in point. This is a load test on a recent build for a nephew. 22-250. I did everything but action thread on his 700 sa because he had a new rem LV barrel. I set the chamber back a bit and rechambered with a manson reamer. Extended the factory tenon thread. Used a ptg .300 lug. Glass bedded it in an old HS Precision stock I had. While I know everything on the action was legit within a few thenths, the barrel and action threads were class 2 at best. Probably worse. [ATTACH=full]132048[/ATTACH] These groups were all shot off a bipod. Get a gun concentric and it will have low harmonics and shoot everything to same spot. The bottom right group was a load for another 22-250 we built. The question is simply, how much is enough? No shooter will ever out shoot or shoot better than this gun. And I would not call it a $$$$ build. So yes, we can chase tolerances to an extreme but unless you are shooting bench matches, and even then, the tolerances a lot of people tout are seldom realized or necessary. The trick is knowing where tolerance is critical. [/QUOTE]
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