Funny thing is, Federal's site doesn't have .45 ACP, it has .45 Auto.

Same for the Winchester site.

I think that's weird.

So, .40 S&W has higher velocities than the .45 Auto, in every comparison I did. SO I guess the .40 S&W would have more advantages.

What kind of advantage does the .45 ACP have? Is the ammo cheaper?