AR 15 jamming?
I have a DPMS AR15 5.56/.223 I ran 20 factory rounds through it the day it came home just fine no problems..I ordered 1000 cleaned trimmed full length resized and primed .223 cases
and loaded 6 of them this evening..the first one I chambered went snap, so did the second, the third fired, forth snap, fifth and sixth wouldnt do anything, I slammed the forward assist and tried to fire and nothing, I nearly strained my eyeballs out trying to get them back out of the gun..I visually cant see anything wrong with the shells, and all had dents in the primer, Out of curiosity I loaded them into my ruger mini 14 and they all fired as fast as I could pull the trigger..no jams nothing..ran just perfect…?? any ideas?? thanks!
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The bullets I’m loading are not boat tail and are difficult to start in the case, I had actually hand flared some to get them started easier while adjusting my bullet depth.. and now that I’m back to my shop this morning I realized that these are the ones that wouldnt feed.. the ones I loaded that I didnt flare all cycled in the dpms fine.. I was my mistake for grabbing the wrong lot..sorry…thanks for your responses!!
Do you have a .223 case gauge? That is the first thing that I would check. Sharpshooter right about the full legnth resize thing. It sounds like those cases are out of spec. Have you measured the case legnth? Just because they were sold as “trimmed” doesn’t mean that they have trimmed correctly. A long case can produce dangerous pressures and prevent the case from seating against the shoulder where the case is supposed to headspace on. Good luck.
Since you said they did not come freely out of the chamber I’ll bet that “full length sized” really isn’t and the ar has a tighter chamber than the mini-14. Mil surplus brass is very heavy in the “web”/base area and if previously fired in a gun with an oversized chamber, like a SAW, will expand enough to cause problems.
Suggest removing the decapping pin from your full length sizing die and resizing a few of the cases before loading and try again.
Above is from experience with once fired mil. brass. gone through several thousand myself.
Sounds like the rounds are loading too far forward or the firing pin doesn’t go forward far enough to punch the primer. I don’t know much about ar’s, but on some of my rifles you can adjust how far forward the firing pin goes, if you can do that with your ar, I’d try making it go a tiny bit farther.
Also you might could try loading a few rounds, but don’t use the shells that came with a primer in it, build one with your own primer, and see if that works, I guess the primer could be a little too hard and the spring doesn’t have enough force to really hit it.
Check this newer product out:
http://www.military.com/news/article/a-quick-fix-for-fouling-m4s.html?ESRC=coastguard.nl
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sharp edge on the front of Mil casings. a case chamfering tool to remove the sharp inside edge will make the bullets seat easier without “flaring” the case mouth.