Golf balls fly great out of a potatoe gun. On my spud cannon my chamber is 4" dia. x 12" long, with a optimal charge of 10seconds of aquanet the farthest i have shot a potatoe is 225ish yards. A golf ball goes way farther, havnt actually measured it but its atleast 300yds. Im thinking a steel acetylene powdered golf ball cannon is thw way to go. Cheaper than black powder, not as cheap as a potatoe gun but it will shoot farther