I'd be with Mooncoon - a 32-40 or 38-55 would be more in keeping with history, and a 32-40 won the plain based bullet and grand championship at the Cast Bullet Association nationals in 2015. Very light recoil I would think. The big rolling block enjoyed a well deserved reputation for accuracy. I have one(just like in Tradeex) rebarrelled to 45-70, restocked, and with good peep sights. It has given me four consecutive five shot groups at 100yds that averaged under 1". I'd suggest a longer barrel for better appearance and better balance. Some weight is helpful. The sporters at tradeex weigh about 8.5 lb. which really isn't very heavy, and have a 34" barrel.
Grouch