Anything goes??
nah... its too hard to get a seal on the squirrel.
The main problem with squirrels is that they tend not to stay put. (especially wild ones)
I've shot every vegetable, small athletic ball, and bizarre projectile you can think of. My favorite was probably a potato injected with paint. This works OK with other foods, but not as well. Basically, you've gone from spud gun, to deadly paintball rocket.


