I have been shooting a 54 Lyman Trade Rifle. This winter I built a 45 flintlock off some parts I found and a piece of walnut I had. I had so much fun doing it, that I want to do another one. I am thinking of a .62 smoothie. What length of barrel should I be ordering? I would like to shoot both round ball and shot from it. Round ball for deer or moose and shot for grouse etc.