Re: chunk gun
I am intrigued by the type of competition. Never actually attended or shot such a match.
When and where?
As I understand it, chunk gun matches are for round ball guns, shot in prone position, with a muzzle rest, at a 60 yd target that is shaped like an "x" and closest to the x wins. One shot per target and several targets over a number of relays. With the shooter having the shortest string measure being the winner.
While any open sight round ball gun can be used, specially shaped butt stocked, heavy barrel guns are used by fans of that type of shooting.
ERH, please correct me if I describe anything wrong.