IT has a 20" stainless fluted 1/8 BBL. I really don't know much about this end of the system, but I need to be able to advise him. We'll probably start shooting 55g WWB will that shoot well through it? Is there a source for 62g or heavier rounds in bulk?
What about BBL break in? I only have chrome barrels so I really don't know.
With a 1/8 barrel don't waste your time with 55gr go with 62-77gr. You have the right twist to reach out. Black Hills provide 62-69 grain go with the heavier grain bullet. If you can find 75-77 gr get that. Break in is 3 rounds stop, swap up to 12 times each (36 rounds total). Barrel should not get hot. Next is 6-8 round groups up to 200. Blaze away after that.