If you want to practice in your garage, you can use Speers plastic training bullets. Powered with primer only. Haven't tried it with .45acp yet, but use them all the time for 9mm and .308acp. They won't cycle the autoloader, obviously, but they are great for draw & shoot drills, and seem to shoot near enough to POA that I can't tell the difference in impact between the plastic bullets and 'real' bullets.
And you can re-use 'em, so the only cost is the cost of primers.
I hang an old surplus wool blanket as a backstop, tape on target(s) and drill as desired. The blanket catches the bullets and makes it easy to find them in the garage (especially if the garage floor is somewhat clean....)
Somebody makes rubber practice bullets, too, but I have never tried them. Just found the Speer bullets locally, and have been using them ever since. Still on my ooriginal box after 2+ years....