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Rifles, Reloading, Optics, Equipment
Reloading
Help, excessive headspace question
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<blockquote data-quote="Tennessee Tater" data-source="post: 852499" data-attributes="member: 54647"><p>Hi all, I have a question regarding max headspace. I purchased a factory 338 RUM barrel, screwed it on with a new PTG .186 recoil lug, and rented a set of PTG headspace gages form 4d reamer rentals. The bolt will close on the no-go gage, but will not close if I add a piece of .002 feeler gage onto the back of the no-go gage. I measured the go gage with a Hornady headspace gage, then the no-go gage. There is .004 difference between them.</p><p> </p><p>The Hornady gage doesn't measure at the true datum line, the go gage measures 2.3750, the no-go is 2.3790</p><p> </p><p>The SAAMI chamber drawing for it shows headspace is 2.3490 min to 2.3590 max.</p><p>I don't think the go gage is at min chamber spec. </p><p>I primed a piece of brass, chambered it and fired it. The primer detonated & it looks like the firing pin hits the primer hard. It is deeply dented.</p><p> </p><p>My buddy says to strap it down in a lead sled and pull the string (I know, doesn't say much for the company I keep, & it's not his rifle that may come apart).</p><p> </p><p>Any ideas other than setting it back?</p><p> </p><p>Thanks</p></blockquote><p></p>
[QUOTE="Tennessee Tater, post: 852499, member: 54647"] Hi all, I have a question regarding max headspace. I purchased a factory 338 RUM barrel, screwed it on with a new PTG .186 recoil lug, and rented a set of PTG headspace gages form 4d reamer rentals. The bolt will close on the no-go gage, but will not close if I add a piece of .002 feeler gage onto the back of the no-go gage. I measured the go gage with a Hornady headspace gage, then the no-go gage. There is .004 difference between them. The Hornady gage doesn't measure at the true datum line, the go gage measures 2.3750, the no-go is 2.3790 The SAAMI chamber drawing for it shows headspace is 2.3490 min to 2.3590 max. I don't think the go gage is at min chamber spec. I primed a piece of brass, chambered it and fired it. The primer detonated & it looks like the firing pin hits the primer hard. It is deeply dented. My buddy says to strap it down in a lead sled and pull the string (I know, doesn't say much for the company I keep, & it's not his rifle that may come apart). Any ideas other than setting it back? Thanks [/QUOTE]
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Help, excessive headspace question
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