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Rifles, Reloading, Optics, Equipment
Gunsmithing
Scarring Across the Chamber Throat a Problem?
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<blockquote data-quote="Pdvdh" data-source="post: 2208154" data-attributes="member: 4191"><p>A major manufacturer of cut rifled barrels. That should suffice. Not even 100% certain what's amiss yet. But I've got a pretty good idea.</p><p></p><p>Thinking I'll run it past the manufacturer, with the photos, after the holiday weekend. </p><p></p><p>I don't think the Smith that cut the chamber has anything to do with this issue. </p><p></p><p>Really looking like the groove cutter cut too deeply in the one groove. Such that after the chamber reamer cut the throat, the tool marks from the cutter remained. Would be no way for anyone other than the barrel manufacturer to catch this prior to cutting the chamber.</p><p></p><p>Barrel manufacturers hold some incredibly tight tolerances. So they must have a way to monitor the depths the grooves are cut. It probably requires expensive equipment that only a barrel manufacturer would have on hand. Don't know how they QA/QC test their finished barrels prior to shipment.</p><p></p><p>I suspect a groove cut a mere 0.001" too deep would cause this to show in the throat. Because this bore should be .338" diameter, groove to groove. And this throat should be .3385" diameter. Doesn't leave much room for even a 0.0005" over-cut groove depth.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 2208154, member: 4191"] A major manufacturer of cut rifled barrels. That should suffice. Not even 100% certain what's amiss yet. But I've got a pretty good idea. Thinking I'll run it past the manufacturer, with the photos, after the holiday weekend. I don't think the Smith that cut the chamber has anything to do with this issue. Really looking like the groove cutter cut too deeply in the one groove. Such that after the chamber reamer cut the throat, the tool marks from the cutter remained. Would be no way for anyone other than the barrel manufacturer to catch this prior to cutting the chamber. Barrel manufacturers hold some incredibly tight tolerances. So they must have a way to monitor the depths the grooves are cut. It probably requires expensive equipment that only a barrel manufacturer would have on hand. Don't know how they QA/QC test their finished barrels prior to shipment. I suspect a groove cut a mere 0.001" too deep would cause this to show in the throat. Because this bore should be .338" diameter, groove to groove. And this throat should be .3385" diameter. Doesn't leave much room for even a 0.0005" over-cut groove depth. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Scarring Across the Chamber Throat a Problem?
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