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Well, I found part of my problems. The brass I started with was S&B .223 Remington. The case was obviously too thick. Last night I loaded some winchester brass and my loaded neck diameter was .331 instead of .335. Fired neck diameter was .334 instead of .336. The brass worked easier and the shoulder was pushed back to where it should be to chamber.
It seems I am hitting the lands at 2.112" OAL with the 220 MKs, so I am loading to 2.110. I tried 8.4gr of AA#9 and it has a supersonic crack. How heavy should I crimp the bullets? I am crimping by turning the seating die in 1/8th turn from when it touches the case. I pulled a couple bullets with an inertia puller and there were no marks on the bullet, but they required several solid blows to come out.
Now, my next problem is ejection of the fired cases. It seems the action is not going back far enough to eject the spent case. The case comes out, but not far enough to clear the breech and the action hangs. I am using a standard AR front sight/gas block, 16" barrel. Does it possibly not have enough pressure? As I said, they are still supersonic, so I know the problem will be worse when I load subsonic.
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