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This would take some serious work, but what if you could make a system similar to the gas powered grenade launchers but so that it shoots in multiple directions. You could rig it up to a tennis ball or similar sphere (even a football would work). Then put a trigger or pressure sensor so that when it hits the ground the BB's fire out of holes in the sides of the projectile.
I have no idea how you'd manage something like that but I thought it'd be most effective. Probably still have a problem with losing the projectiles.
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