My loader works with the Rugers, Colts and Remingtons, from .31 cal. to .45 cal. I understand the need to be consistent when loading. It was that quest for consistent loading that spurred me to make my loader. Previously, the shooter relied on "feel" each time he loaded. With my loader, you still use "feel", but only to load the very first chamber, after locking in the seating depth, the only variable would then be the measured powder charge. My loader will consistently seat the ball to the same depth each time you lower the loading lever.