I too, am blessed with strong thumbs. When new, the mags on the P365 were incredibly strong, especially on the last round or two. I had been gifted the UPLULA years before and had never used it...until the P365. The loader worked like a champ, but the mag springs have loosened over time, so I put it away. Word of caution, first load a single round by hand before using the tool. Otherwise, the tool might lightly gouge the follower. Don't ask me how I know.