Inthebushes

Normal, finish wearing off? Bolt carrier looks good.

As soon as my boss takes her happy butt to bed, I'm going to look at the bolts travel in that upper. I'm betting there are some shiny spots that aren't suppose to be there.

Suppressor probably to blame for the dirty cases. Gun was clean and brass was new and shiny when I fired the first round. Can't understand why the bolt would just stop. It wasn't in a bind reward or forward after I moved it. I'm thinking now something has to be wrong with the upper. I can't look at it right now, but something had to stop that bolt mid flight. It wasn't the ammo, I checked it before and after. As for the dented shoulder, I have seen several of those with this gun. I've got to stop that as well. What causes that? I did polish and smooth the ramps before installing the barrel, but maybe I need to go back?

First the good news, the gun shoots pretty well. This 8 round group was to be 10. The 9th round failed to go fully into battery; about 1/2 inch short. The 10th round was sitting in magazine as shown in photo. My instinct was to eject the 9th round, but as I moved the charging handle back, it was very easy, not stuck, so I let it go, and it went easily into battery, and then ejected easily. I had dropped the magazine, so I took a photo of that round as it was. The 10th round has a long, deep scratch on the brass, and pretty deep dent in the bullet. The scratch seems to be a rotating scratch, I'm guessing the 9th round, but I have never seen this before. The dent, I can't explain. The malfunction, I can't explain. Any ideas? New brass, pmag. Also I'm seeing a dent on the shoulder of the 9th round, and I have seen this exact dent on several fires cases from this new gun.

Appreciate the welcomes, sorry for posting in the wrong area and I'll pay more attention, and thanks for the advice. I shortened everything up a bit today and all was well. I noticed the factory Hornady had slight marks on loaded but unfired bullets. I was copying their dimensions. I shortened the COAL a hair and dropped back to 36 grains on 10 rounds, and they ran fine. That was all I had time for today. I'll be reading everyone's post looking forward to learning what you guys know. Thanks again to everyone.

Im new to the AR10 platform, but have been shooting and reloading AR like platform for years. Shoot almost daily and every weekend; typical stuff, pistols, Grendel, 5.56, 300 BLK, etc. My wife got me a 10 lower for Father's Day. A new sickness was born. I'm not rich, so I try not to spend a lot of money, and I try and do things myself. I usually spend more, than if I had just went and bought one, but that's part of the sickness. My first AR10 hates my reloads. It works 100% with factory. Single reload, fires, bolt locks back. Load a magazine, fires first one but jams the second one in there before the first one can get out of the way. It's a timing problem. Creedmoor, 24 inch barrel, 39 gr H380. 140 Hornady ELD match. Is it the H380? The gun loves the factory loaded 140s. All reloads pass the case gauge.