Then it might be fun to try. Besides, there are several guys out there with .45 GAP ammo they bought by mistake I bet you cold get cheap. Mags would still be a trick, but if they can put a spacer in a mag for 9mm (may not be the one to rely on) why not a .45 GAP.Why would you want to build a .45 GAP 1911?
Like I said, just want to do some experimentation. I've got "wildcattin'" in my blood!
It would be interesting how it would perform in a bullseye format type pistol. Since your are using reduced loads anyway, why not? Just like accuracy in a rifle, the fuller the case, normally the more accurate the load will be.
That's the reason behind this foolish thought. An expensive experiment.