Congrats Kurt, sounds like a nice project. The Shikari barrels are long noted as being great cast bullet shooters, no microgroove rifling to deal with, ballard AFAIK. I've checked most of the six modern 45-70 barrels I have, they're all 1:20" so far, all are older ejector barrels, not as old as a Shikari tho, I haven't checked the newer extractors yet, but I'll check them.
Tim