Yeah 45-120 is a hoot. Years ago I had a 45-70 H&R Buffalo Rifle rechambered to 45-120. When I got it back from having the 30" tube brass telescope mounted a buddy insisted that he had to have it...That seems to be to story of my guns, I come up with what seems like really cool guns and end up selling them to buddies who only see the beauty of the project once its in their hands, then Im off to the next. That was when I was young, now Ive reached the point in life where I want what I want FOR ME!

As for making brass shotshelss from 50 BMG shells, well I guess its about as simple as making shotshells from a 68 VW bumper. I assume youre talking about the 12ga from hell stuff. Just take a look at a 50 BMG case then tell me how much lathe work you think it needs....