I built a pneumatic cannon I call "BIG NASTY".It's about 12' long,the barrel is 10' long 3" sch40 pvc.It can shoot 20 oz coke bottles frozen about 500 yards.At 20 yards it can shoot a frozen or thawed coke bottle on its side through 3 sheets of 5/8" plywood.At 10 yards it can shoot a 20 oz coke bott...