I've shot this gun with open sights and scope so don't think sight problem, this gun does not have a removable breech plug so I am leery about forcing a .54 ball in there, even though it does sound like a good idea. What would happen if I used some valve grinding compound on a very tight patch ball combination and shot it out with around 20 gr of powder? Maybe did this 4 or 5 times running a couple patches down in between? Sort of a homemade fire lapping. Also anyone now if these old guns liked heavy powder loads or lighter loads. Thanks guys.