Had the same problem on all three of my 45 blackhawks. I reamed a Taylor Throat in two of them and could not be happier. Accuracy got better and leading has all but disappeared.....The third one I cut an 11 degree forcing cone, but have not really messed with it yet except for a few shots.....
I have been looking all over to buy one. Clymer does not make them anymore and I cant seem to find one anywhere. I have 3 Blackhawks that all have a tight spot at the threads and I am getting frustrated. Anybody know where I can get buy one?