I have .45ACP's semis, (Colt and Browning BDA) several Ruger SA revolvers in .45Colt, (a couple with ACP cylinders as well) and a couple of semi autos that shoot the .45 Win Mag (one gas operated one recoil operated), and I have barrels for my Contender for all those cartridges as well.
Also had a .45acp semi auto Tommy gun, but I passed that on to my son a few years ago...kinda miss it, oh well...
Don't have any of the bigger .45 caliber cases, don't have a use for them
which is not the same as saying there is no use for them,
I've had a .45 caliber handgun of my own of some type since 1980, and won't be without one.