there has probably been more 45 auto ammo shot down range with bullseye then all the other powders combined. Ive used it in many thousand 40s too. 4.5 and a 180 work fine in my guns. I cant figure why it would be an excellent powder in the 45 and to fast for a smaller case. Now if i a guy is looking for full power loads theres proably better powders but for accurate range loads its hard to beat.