I want to do a 450 Bushmaster AR pistol to skirt the hunting regs in IL; Here's how I'd do it:
-Make a screw in mag block that I can semi permanently attach so it's single shot.
-Straight walled cartridges of any length are legal from a single shot or revolver
Welcome to politically incorrect deer hunting in IL.
Besides that, something I'd point out is these aren't bad to shoot if you've got brass to reload and cast your own bullets. You're not going to make a million of em anyways, but with Powder Coat and lead I could do it for under a quarter a shot. A lb of lead doesn't go far (20ish bullets a pound) but hey it's not that out there really and considering I was paying a buck a pound that's a nickel a bullet.