Ok I a test. Dropping a 30 inch by 1/2 inch dowel rod a distance of about 32 inches down the barrel I was able to move the ball about 3/4 inch.

If it's soft ammo you should be fine. There are ways to test what ever you want to launch. Is your cannon a pneumatic or combustion? Welcome to Spudfiles. :mrgreen: Combustion. They are soft but I doubt they'd break apart under pressure or anything like that. They need to be slightly compresses to ...

So I just got my first spud cannon and it fires like a charm,but I was wanting to use different ammo besides potatoes. So I went to Walmart today and got some foam practice golf balls. The thing is they are slightly bigger than my barrel ( about .1 of an inch bigger). They fit if I squish them a bit...