seams like a inpossible task lol,

what range would you expect to see from a marble size projectile?

Hi all,

After some advice i want to build a marble firering cannon.
and was after some advice on best route to take.

I might be abit optomistic but after a shooting range of around 4oo meters is this possible?

I have made combustion and pneumatic cannons in the past but have fired larger items ...