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Get some buckshot, btw. Some say use birdshot/turkey loads, BB, etc. for HD in 12 gauge. I guess it COULD suffice, but in 20 gauge, go with some 00 buck.
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Good advice, but be aware that 00 buck in 20-gauge is rare as hen's teeth - in fact, I think your only option is handloaded ammunition. I ran into this problem when trying to find 00 buck for my 20-gauge, because my local range only allows slugs or 00 buck for shotguns.
The problem is that the geometry of a 20-gauge shell doesn't allow for an efficient arrangement of 00 pellets. the diameter of a 00 buck pellet is .33 inches, while the diameter of the case is .615 inches. Thus, you can't get more than one pellet to fit side-by-side in the case - you have to do a staggered arrangement, and the patterning is pretty much crap as a result.