Thought I would post this over here. The cannon is 1/4 scale.
http://www.youtube.com/watch?v=2ZOejRvfv5g
http://www.youtube.com/watch?v=2ZOejRvfv5g
used to suck on those for 20 minutes to get them to fit our 1.25" cannon barrel. They would blow right through a two by four.Jawbreakers make great "plinking