In my 625PC, I've been shooting a 200 grain lead round nosed flat point bullet (45 Colt bullet from Penn Bullets) over 3.6 grains of Clays and Federal large pistol primers. A buddy chronographed this out of my gun at an average of 605 fps, yielding a whopping power factor of 121. This is super mild and great for steel. The round nosed bullet loads nicely in the cylinder. My warning would be not to reduce the load. Also, be prepared to be spoiled after shooting it - very soft and sweet.