I reloaded my own .45ACP shotshells for several years. I used 7.62 GI brass and cut it off. RCBS makes both special reloading dies for shotshells and also case forming dies for shotshells from rifle brass. At the time I bought mine they weren't too expensive but I'm willing to bet they are now. I used .410 wads, 700x powder and #9 shot. They worked fine. I started doing that in the 70's. However, these days CCI sells aluminum cased shotshells in nearly every caliber one could want and so to reload them is an exercise that is hardly worth the effort. The only handgun shotshells I consider worth the effort to reload are .41 mag and a friend does that and I use the ones he has come up with when I need them. I have .45, .44, .38, .22 and .22 mag that I have purchased and just take them with me when needed. It's a heck of a lot easier.