Hi Tom - I would send it to Bobby Hoyte for rifling. I would also get a twist in the range of 80 or 85" with .008" to .010" deep rifling.

That way, it will shoot OK with 3 to 4 dram loads, much more comfortable than double that amount of powder that might be needed to shoot well in a slower, Forsythe style rate of twist.

Were I a younger man, I'd go with 102", or thereabouts and shallower, maybe .006" to .008" deep.