Zeus wrote:SB and others have got 300 yards and up with a combustion
Never without something more aerodynamic than standard spudgun projectiles, however.
My furthest shot with a spud was about 290 yards, and that required a muzzle velocity of ~700FPS, a moderate tailwind, and the optimal firing angle given by an older version of my range calculator. Under less controlled conditions, the maximum effective range of such a projectile is not likely to be much over 200 yards.
Given that a hollow shell filled with airsoft BBs or paintballs will have even poorer ballistic characteristics than a spud, I seriously doubt one can expect more than 100 - 150 yards from such a round unless it is extremely long and fin stabilized.