My 1911 Colt, purchased in 1981 or 1982, was in .38 Super.
I only ever had 2 boxes of brass for it - hard to find brass,
so I made my own out of .38 Spl. brass of which I had thousands.
Due to the problem of brass, (I hated losing my home made brass) I converted the .39 Super to .45 ACP with a Wilson barrel. I bought spring guides, bushings and links to play with the barrel to slide "fitting".
Got it to 2" at 50 yards off sand bags, shot the bears with it, used it in little 'shoots' I put on for the local RCMP and my riot squad guys who liked to shoot. I then sold it in a weak moment. One of the gals at work wanted it for her husband for Christmas. Story of my life, that happens so often.