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I have shot a lot of things with birdshot. One notable was a stainless steel fridge. At 25 yards it just put tons of tiny dents in the stainless and also the sides of the fridge (which was also metal but not stainless steel). At about 15 feet it put a hefty dent in the steel and blew a quarter size hole in it at the center, a good chunk of the bbs penetrated. On the non-stainless metal sides the hole was two inches in diameter. Seems like that would be 'adequate' for self defense.
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