I picked up one of the older stainless Winchester x-150s for a good price ($100) so now it's time to start playing around with it.
The first lesson I learned is that T-7 pellets won't ignite with the musket cap nipple that's on there. The guy I got it from gave me a box of the pellets with the rifle and they worked on the first shot but never again. I didn't really expect them to work, but I had to try! I grabbed some loose powder to try next time out.
I have a good collection of different .452 bullets sitting around from past projects with various handguns (454s and 460s) so that should keep me busy for while. I found the .50 sabots designed for .458 rifle bullets though and those sound more interesting. I'm a heavy bullet guy, so I like the idea of trying 350-400gr bullets designed for the 45-70. I don't know anyone who's used the .50/.458 sabots though so I'm not sure if they're worth trying. I figure if they offered an advantage the more folks would be using them.