Sent him the cylinder from my NMBH in .45 Colt, had it back in a week, and man what a difference. Cut my groups down by more than half. They were so undersized, It wouldn't even seat my RCBS-45-270 loads, now it shoots them great. Best $39 bucks I've spent to make a gun shoot. (although, I did have pay to fix Rugers sloppy work).