Alternately, you could talk to the Baltimore Gun Club. They have experience with large field pieces. Admittedly, it was used to hit a substantially larger target, but it did hit its mark, more or less (Artillery being one of those sports where "almost" counts as a palpable hit.)

Ebony the Black Dragon

"Life is like an anole. Sometimes it's green. Sometimes it's brown. But it's always a small Caribbean lizard."