That link sums it up with:
Quote:
Originally Posted by The Box of Truth
4. Birdshot does not excessively penetrate drywall walls. But it does not penetrate deeply enough to reach a bad guy's vital organs. Birdshot makes a nasty but shallow wound. It is not a good Stopper.
Use Birdshot for little birds. Use 00 Buckshot for bad guys.
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Though my preference from point of view is for #4 buck and being able to reliably hit what I'm aiming at.