use foam "wadding" with about 2000 bb's per shot (use worst possible quality). makes a very large shower, but range is limited to about 100-150 yds max from the bb's and sometimes up to 300 yds for the foam wadding. we built several mortars like this using either nitrogen at 300 psi or ether ignited in the hand-held version. the ether one makes a big BANG as well.
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