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Posted: 5/3/2013 12:06:24 PM EDT
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I've got an RRA upper ,I was working up a load earlier this week and noticed the brass was being gouged on the neck and had a slight puncture at the junction of the neck and shoulder.I made some dummy rounds and ran them through a cycle and they were the same but not quite as severe. I looked at some brass I had shot earlier and there are very slight marks on it,nothing like these pics. This particular brass was FC headstamp but some LC was the same. ,trimmed to 1.750 and full length sized.It looks to me like it's gouging into one of the lugs but I can't see anything that looks off.I'd appreciate any help. Thanks Mike 
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I'm using p-mags,I tried diff. mags with the same results. I also doubt this is a reloading problem ,but there's a lot of knowledge here. Thanks Mike Strip another off the magazine and slowly extract it. If it's on the bottom its going to be feed ramps more than likely. Was the barrel ever swapped? I'm wondering if the receiver is M4 style, and the barrel is rifle style... that can make a sharp edge and cause feed issues. |
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I've tried p-mags, a d&h Ind. and a master molder same results. I've looked at the chamber again and all I can see is what looks like a scratch,maybe it's a burr. I took the bolt out and dropped a dummy round in, took it out and no marks. I did it again and lightly tapped it and there were faint marks. Maybe there is a burr,but I sure can't figure how it got there or why it got worse.
Thanks again Mike |
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.It looks to me like it's gouging into one of the lugs but I can't see anything that looks off.I'd appreciate any help.
That would be my guess also. Try to index the marks in relation to the extractor claw marks on the rim. If they line up from case to case, then it probably is one or more of the lugs. If so, you could try a weaker ejector pin spring (in the bolt) and/or stoning the sharp corners off the offending lug(s). |
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Yes it is the lugs. Remove or open the upper and look very closely at the lugs. Use a magnifying glass if you have to and feel the leading edges. Also look for brass build up. You should be able to tell which one or ones are doing it.
Often new rifles will even have burrs on them. Over time and use of course these ware down and you end up with just 2 little dimples where the case bounces off of them during loading. Yours are especially bad. I would expect to find a burr or very sharp edge on your lug or lugs. If you have the mechanical knowledge and the right tools you can correct it yourself. I use a round ceramic hone stone or a jeweler's file. you do not want to use anything powered like a dremal unless you are a professional. |
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