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Repairs to boltface

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/11/2009 at 04:50
8shots View Drop Down
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Can a bolt face with the primer pocket area pitted be repaired. The area around the firing pin is pitted.

Simply sanding it down by 2 thou or so would change the head space. So I think it would have to be built up and then machined.
 
Any ideas?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/11/2009 at 08:04
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If you weld it up and then get it machined down, will it need to be reheat treated?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/11/2009 at 09:29
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 It can probably be welded up with the proper welding equipment (TIG?) and then milled back down in a lathe or held upright in some sort of fixture and milled with an end-milling cutter in a Bridgeport vertival mill. The welding aspect of it could probably be done without heating the locking lugs to the point that heat treatment would be necessary, if the operator really knew what he was doing and used Tempilac  to monitor his heat. The face itself does not have to be hardened or tempered as long as it doesn't become glass-hard. The ejector and extractor would have to be removed of course, during the repair, and the firing pin hole would probably end up getting filled and re-drilled to spec, with proper protrusion checked during reassembly before test-firing.
 I've also heard of repairs made in the lathe by cutting out a shallow depression (with a flat bottom and straight/square sides) into the affected area and silver-soldering a small steel disc back into the cut, milling it flush to the face and re-drilling the firing pin hole.
 Having said all that, I wonder if you could just clean thoroughly with acetone and fill the pits with an industrial-grade epoxy. It would certainly handle the compression forces in such tiny areas. and would last until your next pierced primer incident, unless the pits are huge and circumvent the pin entirely.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/11/2009 at 11:33
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I'm sure there are as usual many ways to skin this particular cat. If it was a Savage, you could easily replace the bolt head. Some the head can be replaced if you have the proper tools. I am unsure about yours though.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/11/2009 at 12:06
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unless your having primer flow, or case head flow into the area, why does it matter, It would be easier to make a recoil shield, by drilling out the firing pin whole, and replacing it with a recoil shield similar to handguns, Clark guns does this stuff.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/11/2009 at 12:59
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  I should have asked what the rifle in question was, but for some reason assumed it to be a Mauser type or a 700 Remington...

 As Dale implies, the pits probably pose no issues regarding performance or safety, unless they are extreme in size or depth...

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/12/2009 at 03:49
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Thanks for the feedback. It is unfortunately my 308 Rem. I loaded a Privvi case by error. The capacity is smaller then Lapua. Allthough I am at a safe load in terms of the max (43.4gr with max at 45gr) due to a hot day and smaller case it blew the primer.
The bolt face is only slightly pitted, probably nothing to worry about. Just wondered what is involved to repair it.
I like the epoxy suggestion, or the insert as per Dale. For now I will leave it and assess it further down the line.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/16/2010 at 00:37
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if the dimples are bad enough it can be placed in a lathe and the bolt face turned square.but then the barrel will have to be set back and head spaced.if its necessary this is what i would do. good luck
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/16/2010 at 08:43
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why not just look for a new bolt?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/16/2010 at 09:34
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I agree with Billy & Hunter, it might be just as easy to replace the bolt/bolt head.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/16/2010 at 09:54
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Originally posted by 8shots 8shots wrote:

Thanks for the feedback. It is unfortunately my 308 Rem. I loaded a Privvi case by error. The capacity is smaller then Lapua. Allthough I am at a safe load in terms of the max (43.4gr with max at 45gr) due to a hot day and smaller case it blew the primer.
The bolt face is only slightly pitted, probably nothing to worry about. Just wondered what is involved to repair it.
I like the epoxy suggestion, or the insert as per Dale. For now I will leave it and assess it further down the line.
 
  Knowing now the very small extent of the tiny pit, I really think that there's no need to do anything with it at this point. A new bolt would be fairly costly, and the barrel would need to be set back (or forward) to headspace properly, so you also have those gunsmithing costs in addition to the cost of the bolt. 
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