Punkin Chinkin... what would it take to shoot an 8-10 lb pumpkin 1 mile? I have a 700 gal air tank . How long should the barrel be before the point of diminishing return? Should the bore be 8 or 10" what psi should we shoot at? Note the pumpkin is a white lumina and has a very thick rine and can take the shot of psi no problem.

Thanks!

See here:

Physics: Punkin Chunkin Barrel length, air cannon, pumpkin pie (http://en.allexperts.com/q/Physics-1358/2009/12/Punkin-Chunkin-Barrel-length.htm)