I've been working with my .45 Ruger NMBH Convertible. Accuracy was not what I get with my .44 so I started looking into it. I read that I needed to ream the throats, so I got a Manson reamer and reamed both cylinders. According to the paperwork this should have put the throats right at .452. I tried pushing some commercial cast bullets through but they wouldn't come close to going through even though the box said they were .452. Next I pushed some of the bullets through my Lee .452 sizing die. The bullets were on the larger side, but after sizing them they still wouldn't go through the throats. After reaming my accuracy seems a little improved, but I'm still getting tons of leading in the barrel. I just ordered a .451 sizing die, and I'm going to try that next. Has anyone had a similar experience? Any answers or suggestions? With my .44 Special the bullets go through the throats with a tiny bit of pressure. That gun is as accurate as I can shoot it. BTW, in case you can't tell, I'm new to handguns and reloading. Thanks.