“That was then. This is now. Early 1911’s had a narrow ramp that has to be widened and throated. I have some 1911’s and they all can chamber empty cases. I also use Wilson magazines. I haven’t even used some of the magazines that came with the pistol.”
I’d be interested in seeing that M1911 chambered in .223. ;)
Ruger 10-22 is an excellent choice, and CCI velocitor ammo works well with it.
AR style .223 manufactured with the ‘gas piston’ system such as Bushmaster or Ruger, also S&W are good. Purchase .223 ammo as it will function reliably in either a .223 or 5.56 chamber. Many aftermarket options.