The CCI Maxi Mag proved most accurate with the M48. Cylinder full offhand at 12 yards. BTW, this revolver actually has the service trigger and hammer and Baughman QD front sight. My 1974 (thank you, Tam!) 17-3 has Patridge front, Target Hammer and Trigger. With all four Magnum loads shot it placed four close and two lower left.
The standing barricade shots on the MGM IPSC followed the pretty much the same pattern. Shots marked with Sharpie. I feel like I could make things unpleasant for a coyote or bad person at 100 yards.
This group was fired at 12 yards from my 17-3. I used the Paco Kelly tool to bump the Gemtechs up to .224 and Flatnose. Me likey.