I was watching a video earlier, and in it they were talking about barrel swaps. (10mm to 40 S&W). This made me curious. If I wanted to do something like change my 45 ACP into something based off the 45ACP casing, would all I have to do is change the barrel? I read that .400 Cor Bon is basically a 45 ACP shell necked down to .40 caliber. Would that round work in a 1911 if I just changed the barrel? What other rounds could work? This is mostly out of curiosity. I don't plan on doing this for at least a while.