However, Massad Ayoob once made a convincing (to me anyway) argument why 20 gauge makes more sense for a defensive shotgun.
If I recall, the main thing was the ability to generate much quicker follow-up shots more accurately.
He made a mathematical calculation to show that one can actually "output" more shot per minute with a 20 gauge than with a 12.
Skorzeny
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For to win one hundred victories in one hundred battles is not the acme of skill. To subdue the enemy without fighting is the supreme excellence. Sun Tzu
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