I just built one a few months back. What a gun!! Like you, I'm not a bad shot but I was so amazed with the groups I shot. I ran some 230 gr FMJs, 230 gr LRNs and some 220 gr SWC's. All did quite well but the groups with the SWCs were the tightest. My slide took a couple hundred rounds to loosen up. At first it choked a bit on the last 1/2" before going to battery. I had a few rounds that needed some help. My last 500 have been flawless. I even ran some 185 gr JHP through it just to see what happened. All fed perfect and blew the 10 ring out at 25 yds.
When I was building the gun, every single part except the grips and grip screws had to be fitted. Even the holes in the frame for the slide lock, safety, sear pin, and hammer pin were under sized. When I got the gun finished, it was the tightes 1911 I'd ever seen. Only got about 750 rounds through it but it's still tighter than a mouse's ear.