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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Lapua Headspace Problem?
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<blockquote data-quote="SHRTSHTR" data-source="post: 332571" data-attributes="member: 12514"><p>Cowboy,</p><p> </p><p>Sorry I have not replied sooner, have been helping my son get ready for his guided Mule Deer hunt.</p><p> </p><p>I took your advise and completely stripped the bolt and cleaned everything. When trying the Go pin the bolt dropped freely. I did the same thing with the No Go gauge and it also dropped freely.</p><p> </p><p>I finally got my .001 shim stock. I took one .001 shim applied a very small amount of grease (TW25B Kleen Bore Grease) layed it on the bolt face and tried the No Go gauge again. It too closed freely. I added one more shim for a total of .002 and the bolt did not close.</p><p> </p><p>I called PTG and they said the tolerance between the Go & No Go is .004 This is telling me that I have .005 headspace.</p><p> </p><p>On a side note, when I took the ejector pin out of the bolt I noticed the material around the ejector hole was raised above the bolt face. It looked to me like the ejector pin hole had been drilled / reamed after the bolt face was machined. </p><p> </p><p>I believe that the excessive headspace and burr around ejector is what I have been seening as pressure signs.</p><p> </p><p>Ray</p></blockquote><p></p>
[QUOTE="SHRTSHTR, post: 332571, member: 12514"] Cowboy, Sorry I have not replied sooner, have been helping my son get ready for his guided Mule Deer hunt. I took your advise and completely stripped the bolt and cleaned everything. When trying the Go pin the bolt dropped freely. I did the same thing with the No Go gauge and it also dropped freely. I finally got my .001 shim stock. I took one .001 shim applied a very small amount of grease (TW25B Kleen Bore Grease) layed it on the bolt face and tried the No Go gauge again. It too closed freely. I added one more shim for a total of .002 and the bolt did not close. I called PTG and they said the tolerance between the Go & No Go is .004 This is telling me that I have .005 headspace. On a side note, when I took the ejector pin out of the bolt I noticed the material around the ejector hole was raised above the bolt face. It looked to me like the ejector pin hole had been drilled / reamed after the bolt face was machined. I believe that the excessive headspace and burr around ejector is what I have been seening as pressure signs. Ray [/QUOTE]
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338 Lapua Headspace Problem?
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