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Hey, No Problem with the help.
I just got into the .300 last fall, and the guys here helped me get through some problems I was having. Last summer I built a house in the country were I have my own range, and can do a lot of chronographing/load work literally out my back door. If it wasn't for this, I think I would not have attempted the .300, as it does seem to take a little experimenting to get it to work right.
But, in the long run, I think it's worth it.
I also don't like to work, and would rather reply to this forum.
Probably a good idea to try the dummy route first, as I jumped right into it, and ended up pulling out a bullet and dumping powder into my receiver (I have become an expert at stripping a lower, due to this happening a couple of times).
What brand Upper/Barrel do you have? Is it a new bolt, or a used one?
Are you dropping the round directly into the chamber, and then closing the bolt, or are you feeding it from a magazine?
As a rule of thumb, in semi autos, you should always feed from the magazine.
I can't picture the front of an AR bolt in my head right now, but it it works like most bolts, the round is designed to come up under the extractor. If it is dropped in and the bolt closed, the extractor may have to snap over the rim, and if the bolt is not worked briskly, it may not do this.
Of course, like I said, for some reason I can't picture what the extractor looks like, and I don't have an AR with me at work.
So, I could be way off, but it is a thought.
The round should not be falling in too deeply, as it should head space on the shoulder, like you said.
I'll keep thinking about this one....
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