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Posted: 6/14/2014 1:27:09 PM EDT
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Need some help. Shooting my 300blk and after a few rounds the case didn't eject. Looked at bolt and it had unlocked and started to eject the case but only moved about 1" back. The charging handle pulled really hard but I got the case to eject and moved it back about another 1-2". I'm afraid to keep pulling it back. Obviously I can't separate the upper/lower at the moment. Forward assist is no help, already past the engagement points on the bolt. Advice?
Also noticed it looks like the primer blew out of the case, they are handloads. 155g Sierra match with 16.8g of 300mp. No signs of overpressure prior to this. 16" rainier match barrel , rainier upper, and rainier BCG with gunfighter CH if that helps. |
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If a new barrel, you need to clean the Hell out the chamber. Quoted:
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Thanks guys. A little WD40 with some mortaring and it's free. Disassembled and didn't see anything wrong, bolt cycled smoothly so I ran a few more rounds and no issues. If a new barrel, you need to clean the Hell out the chamber. Of fully size and trim the brass correctly. |
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Barrel has about 200 rounds without issue until now. It's been cleaned a couple times. Brass was all purchased at PSA and I double checked all the lengths but didn't resize any of it. Can that cause bolt to hang up even after brass is ejected? |
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I am a bolt gun shooter and a reloader who can custom size my brass to the chamber. If possible I will only push back the shoulders .003" never had a problem with extraction.
did have a problem with blown primers in a 300BO. It might have been the round before that one that would not extract. You could of had a blown primmer somehow make its way up into the CH area and get jam in that way. Meet a guy at the range that had a once fine shooting AR suddenly turn into a slide action rifle. Only after his second time conducting disassembly and inspection did he notice there was a blown primmer stuck in the gas carrier key. That had us all puzzled. |
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This: "...You could of had a blown primmer somehow make its way up into the CH area and get jam in that way..."
Even a small piece of a blown/fragmented primer can jam up the BCG. And when you mortar it and/or disassemble the BCG it (or pieces) might fall away un-noticed. Also check the firing pin bore through the bolt, cam pin helix, etc. |
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Quoted:
This: "...You could of had a blown primmer somehow make its way up into the CH area and get jam in that way..." Even a small piece of a blown/fragmented primer can jam up the BCG. And when you mortar it and/or disassemble the BCG it (or pieces) might fall away un-noticed. Also check the firing pin bore through the bolt, cam pin helix, etc. I with this. The case was already gone, so it wasn't a chamber/case un trimmed issue. I would bet if you look close you will find a mark along either the BCG, the upper or both where a primer got stuck and was dragged along between the two. |
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Quoted:
This: "...You could of had a blown primmer somehow make its way up into the CH area and get jam in that way..." Even a small piece of a blown/fragmented primer can jam up the BCG. And when you mortar it and/or disassemble the BCG it (or pieces) might fall away un-noticed. Also check the firing pin bore through the bolt, cam pin helix, etc. This. Blown primers (or fragments of them) get into all sorts of places you wouldn't believe possible for them to get into. Smashed between the carrier and the receiver, between the cam pin and carrier body, in the extractor, in the disconnector...just about anywhere. Steve/RRA |
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