My 12 gauge shotguns that are in the house for feral person defense are all loaded with 00 buck and the 20 gauge is loaded with # 4 buck. Would not trust bird shot. Would not want to get shot with it myself mind you, but would not trust it for the stated purpose.
The shotgun that's in the shop intended for feral cat defense is loaded with 1 1/4 oz of lead # 4 birdshot at 1300 FPS.
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