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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel Prefit Methodology
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<blockquote data-quote="tobnpr" data-source="post: 2367305" data-attributes="member: 68758"><p>I've never seen a shim system for this.</p><p>It is possible to headspace a new barrel by using an oversize recoil lug, and having it surface ground to the dimension needed to headspace- but you need a surface grinder or take it to a shop with one for best results. I've read where some will stone them, but that's not particularly precise.</p><p></p><p>You can request (depending on the barrel manuf) either short-chambered, or short-shouldered barrels. Most do one, or the other (or neither).</p><p></p><p>Most common is short chambered, as it does not require a lathe/machining. Deepen the chamber with a reamer/T-handle until the bolt closes on the go gauge. Tricky process, best to fit a reamer stop to the reamer- it's obviously easy to go too far which would then require machining the breech and shoulder. Depending on the chambering, they make "pull-through" reamers, which are run in through the muzzle.</p><p></p><p>If you have a lathe, but not the tooling for chambering (or just don't want to mess with it), the short-shouldered barrels are usually set up with the shoulder "short" by 20 or 30 thou, and are fully chambered. Barrel is dialed in on the lathe and the shoulder set back until headspace is correct. </p><p></p><p>Just some options...</p></blockquote><p></p>
[QUOTE="tobnpr, post: 2367305, member: 68758"] I've never seen a shim system for this. It is possible to headspace a new barrel by using an oversize recoil lug, and having it surface ground to the dimension needed to headspace- but you need a surface grinder or take it to a shop with one for best results. I've read where some will stone them, but that's not particularly precise. You can request (depending on the barrel manuf) either short-chambered, or short-shouldered barrels. Most do one, or the other (or neither). Most common is short chambered, as it does not require a lathe/machining. Deepen the chamber with a reamer/T-handle until the bolt closes on the go gauge. Tricky process, best to fit a reamer stop to the reamer- it's obviously easy to go too far which would then require machining the breech and shoulder. Depending on the chambering, they make "pull-through" reamers, which are run in through the muzzle. If you have a lathe, but not the tooling for chambering (or just don't want to mess with it), the short-shouldered barrels are usually set up with the shoulder "short" by 20 or 30 thou, and are fully chambered. Barrel is dialed in on the lathe and the shoulder set back until headspace is correct. Just some options... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Barrel Prefit Methodology
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