All buckshot ammo has a plastic or fibre wad between powder and shot, or do you mean ammo that uses an over-shot wad instead of a crimp closure?
Winchester, Remington and Federal all make 20g shells with 20 pellets of number 3 buckshot which is a bit bigger than BB. Probably marginal on deer, might do OK on goats close up.
No one makes 20g 00 buckshot shells that I can find. I guess the big pellets wouldn't stack well in the small case.
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