In my Blackhawk convertible it is pretty accurate with all loads but it really stands out with 200 gr. SWC sized to .452. Either store bought or home cast TL style. These are very accurate out of both 45 Colt and 45 ACP with the edge going to 45 ACP with home cast TL. I reamed the throats in both cylinders to .452 as they were all undersized.