Here's a crazy thought. Buy an extra 1917 .45acp cylinder and ream it out an extra 1/16" to chamber some 460 Rowland rounds!!! I have a conversion installed in my Springfield 1911 and it's what I've been carrying in the woods in place of my S&W 629 .44Mag. The only question is can the 1917 take the power of such a round? It gives you 44 mag performance out of what's basically a .45acp case on steroids. My standard 230grain Hornady XTP does 1300 fps from my 1911 conversion. It's a great round.