Robar RaceFrame Alloy Glock Frames makes a stainless frame glock in 45 gap. no 45 acp. though. i'm sure that can hold at least ten rounds. expensive though. possibly taurus and smith&wesson have steel or alloy framed pistols in 45 also but can't remember if they hold more than 10 rounds. good luck in the hunt!
I sold my 220. For some reason it just didn't shoot the way I wanted. Seemed as if it had a lot of muzzle flip. I found some 220 .38 Super mags I need to sell too.