I'm not one of the gun gods, but I'll chime in:
Why use a 20 gauge? It's a specialty gun that doesn't offer anything that a more common gun can't already cover.
A properly loaded 12 gauge (2 3/4 "low recoil" or "buffered magnum" OO buck) is pretty much umpty-zillion times better.
And giving your 95 pound girlfriend a shotgun is probably about as effective as giving her a halberd.
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