I have an Encore muzzleloader barrel with a pretty pitted bore. My plan was to use it as a stub and sleeve another barrel into it. Problem is, although this has been done plenty of times and there was a company a few years back that sold just the stubs, I can’t find any info online about overall dimensions for the ID of the stub or the OD of the sleeved in barrel.

Anybody ever done one of these, or have one of these, or can offer some input?