.45ACP should never be crimped, because the round headspaces on the case mouth. A tiny amount of crimp may seem harmless, but it could also bulge out the case behind the crimp enough to exceed appropriate dimensions.
Also check for any roughness in the chamber. There may be just enough to interfere with certain brands or reloads. And hand-polishing the feed ramp with some crocus cloth wrapped around a dowel never hurts. It should shine like a mirror.