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Rifles, Reloading, Optics, Equipment
Gunsmithing
Headspace Advice Needed
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<blockquote data-quote="Fitch" data-source="post: 393273" data-attributes="member: 19372"><p>If one is looking for repeatability, I don't see how a case can be as good as a go-gage - a case will give (yield) more than the presumed desirable tolerance for a chambering job - they are pretty soft compared to a solid steel gage. I suspect most folks don't know what the dimensions are anyway, and if they use cases as gages they certainly won't be confused with any real data. Regardless of whether or not it's standard practice on a forum it doesn't seem like a good idea to me. Seems like the ignorance is bliss never to be confused with facts approach, but that's just me. </p><p> </p><p></p><p> </p><p>Bingo! </p><p> </p><p></p><p> </p><p>I have that video, and I have a ton of respect for Gordy. The tape works for him as a no-go and is tighter than a real no-go, but if he was checking a rifle that has problems for headspace I suspect he'd use a no-go if the bolt closed on the tape.</p><p> </p><p></p><p> </p><p>I know it's a lot of torque, but it's only a preload of ~12,000 to 13,000 lbs using the sliding (not static) friction coefficient for good assembly lube. I torque it up using one smooth motion and a click stop wrench. Once I stop I don't try to move it farther. With good assembly lube the feel and motion are very smooth.</p><p> </p><p>The temperature difference between the barrel tenon (which gets hotter faster) and the receiver (which only gets heat that makes it across the relatively poor thermal connectio to the barrel tenon) grows the barrel tenon more than it grows the receiver which means the tendancy is for the threads to get looser as the barrel heats up. Probably doesn't matter for a hunting rifle that sees one round, maybe two, seodom three other than at sight in time. Might matter for a PD rifle that could get pretty hot, might matter for a match rifle that shoots 10 to 15 rounds per relay counting sighters and score rounds. </p><p> </p><p>Anyway, I don't want to worry about it so I torque it up. That's my story and I'm sticking to it. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p> </p><p>Fitch</p></blockquote><p></p>
[QUOTE="Fitch, post: 393273, member: 19372"] If one is looking for repeatability, I don't see how a case can be as good as a go-gage - a case will give (yield) more than the presumed desirable tolerance for a chambering job - they are pretty soft compared to a solid steel gage. I suspect most folks don't know what the dimensions are anyway, and if they use cases as gages they certainly won't be confused with any real data. Regardless of whether or not it's standard practice on a forum it doesn't seem like a good idea to me. Seems like the ignorance is bliss never to be confused with facts approach, but that's just me. Bingo! I have that video, and I have a ton of respect for Gordy. The tape works for him as a no-go and is tighter than a real no-go, but if he was checking a rifle that has problems for headspace I suspect he'd use a no-go if the bolt closed on the tape. I know it's a lot of torque, but it's only a preload of ~12,000 to 13,000 lbs using the sliding (not static) friction coefficient for good assembly lube. I torque it up using one smooth motion and a click stop wrench. Once I stop I don't try to move it farther. With good assembly lube the feel and motion are very smooth. The temperature difference between the barrel tenon (which gets hotter faster) and the receiver (which only gets heat that makes it across the relatively poor thermal connectio to the barrel tenon) grows the barrel tenon more than it grows the receiver which means the tendancy is for the threads to get looser as the barrel heats up. Probably doesn't matter for a hunting rifle that sees one round, maybe two, seodom three other than at sight in time. Might matter for a PD rifle that could get pretty hot, might matter for a match rifle that shoots 10 to 15 rounds per relay counting sighters and score rounds. Anyway, I don't want to worry about it so I torque it up. That's my story and I'm sticking to it. :D Fitch [/QUOTE]
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Headspace Advice Needed
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