Took the smoothbore out today to try out some different size balls and patching. It is a .62 cal/ .20 ga. I fired 5 shots with .600 rd balls over 80gr of Goex 3f, an overpowder wad, 1/2 a lubed fiber cushion wad, and a ball patched with the same cotton flannel i use for cleaning. This stuff is pretty thin, but with the wads under it it worked fine. Then i tried it with the same load but used .535 (.54 cal) rd balls patched with thick blue jean Denim. They worked good to. Not quite as good a group as the .600's, but good enough for hunting, about 4". This was with my elbows resting on the hood of my Bronco. These smoothbore are really Very Versatile. I now have 70 shots on this flint and it is still in good shape. This is only the second flint i have used since i got the gun. This large Siler lock is a good one.