Sounds like a real nice setup and a lot of fun. That is something I always wanted to give a try. Are you limited to round balls or can you shoot mini balls in them too?
A number of years ago I was at a little gun-shop in PA called "Allegheny Crossroads" and the owner showed me a flintlock and said he hunted deer in PA every December. He told me a bunch of stories and sure got me interested.
He was saying that due to the wet weather in PA in December, he is almost to the point he doesn't prime his pan till he sees the deer coming down the trail.
What kind of groups do you get on paper?