You may know this,but pedrosoli makes intechangable shotgun/rifle brrels for the Mortimer. My friend has them.
Turtle
I considered that, but their barrel is .54 and I want a .58. I'd like a shorter barrel more in line with barrel lengths on English sporting rifles around 30". The Pedersoli is 36. I realize that the barrel could be cut down and freshed out, but given the anticipated cost of the barrel itself, by the time I'm done I'd have way too much money into it. I'm also a bit concerned about whether or not the touch hole in the new barrel
would line up. That would not be easily corrected. I also considered getting a Pedersoli plug (if available)but then there's the issue of the metric threads.
Duane