ya look at my instructable and tie the line to the cannon so when the grenade is far enough it will explode with only a spring and no firecrakers are needed.
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that is hard to think of what would work but try going with a good ole water baloon filled with bbs and water ( speed loader is needed there are instructables on how to make this but its pretty self explained)
ya i tried that but it pops in the barrel
how wide is the barrel?
about 2 inches
https://www.instructables.com/id/No_Explosive_Airsoft_grenade/ try this
than try an easter egg with water and bbs in it , this method kinda works almost works betta then the water baloon