I have owned,and built, flintlock rifles, pistols, and trade guns, over the past forty years, and have never had the pan priming flash back in my face. Now I have not shot these guns in a stiff head wind, but I have shot them in a head wind, and nothing came dark into my eyes. I did have a caplock gun blow fire in my face, but that was do to the drum having undetected flame cutting of the nipple threads, at the rear of the drum. I've also had percussion shotguns, and percussion revolvers, with burned out nipples do this as well. I suspect there might be a breech leak in this gun. If it hasn't been debreeched,and checked, it should be done before anybody fire it again. I M O.
Hungry Horse