Last time I went to the range with my ATI 1911, I forgot my ammo at the house and it was a much shorter run to the local gun shop to pick up ammo than going back home and I picked up a box of steel cased ammo and a couple boxes of aluminum cased stuff too at around $10 a box (gunsmith was cleaning out old stock he took in on a trade). Both the aluminum cased and steel cased stuff ran OK in my 1911. But I'm not a big believer in running anything but brass cased ammo, especially since I reload. That was the first factory ammo that 1911 has ever run.