this is awesome! How are there no replies to this?? Have you shot any of the more potent 460 rowland loads in the last 4 years? Is a barrel swap on a USC something you could do at the range or is it more involved? I'm thinking about a usp 45 tactical with a second barrel/recoil spring assembly set up in 460 rowland. It would be nice to have the same option on the USC so you can move between 45 and 460. I did a bunch of searches and it looks like you are the ONLY person to have ever done this. I saw the other thread were people were advising against it due to double the chamber pressure. I wonder if anyone is crazy enough to try it with the 454 casull? Now THAT would be insane. You should post some vids of your conversion shooting the 460 stuff!