Look around in shotgun news and on line, I had a catalog a few years past for a place that sold 37 mm gas / flare guns and associated ammo as well as all sorts of 12 ga rounds --- bird scare, big ball, flechett, rubber ball, bean bag, lock buster, two balls tied together with a cable, flares, many others -- was maybe a 12 page catalog --- can't remember the name for the life of me but they might well have had something like this, though the absense from the common marketplace suggests that it's of limited use as others have mentioned.
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