Originally Posted by Sniper03
I am still waiting on the answer to the factory rifle or upper question. Or parts gun question. If it is a parts gun it could have excessive head space.
That's the 1st thing that came to my mind, along with extractor? But then again it sounds like its probably ammo. If it is shooting fine up until the point of changing a certain variable, then it usually is that variable. So, I'd ask:
1. Have you always shot that ammo or have you recently changed to that manufacturer?
2. When's the last time you disassembled your bolt for a detailed cleaning?
3. How's the extractor feel when you engage it by hand?
If you can't get that round out with a cleaning rod, "pencil-rod", found at lumber yards/construction supply stores is a better solution, they'll usually let you chop off a 10' section for nothing. It is ~3/16", steel rod, we use it to tie our (concrete) forms on occasion. Just tape the outside of it to prevent scratching on your bore. It's basically a very long punch.