cahillnnc is this an in-line? Also what is the twist in the barrel? Do you want to shoot conicals, sabots, round balls, etc. Do you know what were the loads they used to shoot out of it? That is always a good indication of where to start. If the twist is 1-48 or less, then you can shoot round ball or conicals. If it is even down as low as 1-28 then you can consider the sabots, and conicals. This might not be a BP rifle able to handled the 150 range charges, so keep it at a 100 grains or less until you are sure. Loose powder will help you find your perfect load much faster then the pellets, and is a lot cheaper to shoot. I shoot Pyrodex RS. My .50 caliber Hawkins shoots only round balls because it has a 1-66 twist. I load it with 65-70 grains of powder, a .015 patch and a round ball. My .54 caliber T/C Renegade will shoot round ball or conicals because of the 1-48 twist. Round balls get 80 grains of RS and the conicals get 90 grains of RS. Hope this helps.. good luck hunting this year