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Slugs are good for max of 90 to 100 yards ethical hunting. A fully rifled barrel adds another 25 to 30 yards max.

Magnum 20 Gauge Buckshot loads are max of about 50 to 60 yards.

I would put it closer to 40 yards for the 20ga and about 45-50 for the 12ga because of the small number of the larger Buckshot in the 20 Ga. The 20 ga is better with the smaller sizes of Buck like number 3 buck which will have to rely on pattern density to be effective the 20 ga case is just to small to be effective with 00 or 000 buck