There are two loads of buckshot in 20 guage. The 3 inch shells can be had with # 2 buck and the 2 3/4 with # 3 buck.
The slug works great also.
I think Massad Ayoob pointed out that the 20 seems to give about 70 % of the effectiveness of a 12 for about half the recoil.
Giz
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