I am not sure that you can just chop down a standard 1911 pistol etc, because of all the forces that need to work together. I believe that Colt did quite a bit of experimentation to get their 1911-based 10mm working right. My local range had a rental Delta Elite, and it cracked the slide behind the ejection portion after 5,000 rounds of factory 10s. In my own personal Delta Elite, I load my ammo to 45ACP levels.