From a bit of looking around and reading, I think either standard 45/70 or a cut down version like a few here have suggested will be the go, I'm leaning towards cutting the case down. It's interesting that trailboss is not a good choice.
I can handle all the barrel fitting, chambering, headspacing and so forth,
what I'm really interested in is how the barrel attaches on these rifles, if anyone has any photos or links of one of them disassembled I'd appreciate it.
I will drop gunworks a line and see if they can give me some advise.
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