WindyHills on UJ has been shooting waterfowl for years, using steel, with a 311/5100 Springfield and that gun could be pre-war. Don't know what the chokes are.
One of my grandsons ignorantly shot about three steel loads out of each barrel of his great grandfather's 1930s SXS Stevens 5000 16 ga., choked IMOD/Full with no damage. I told him not to do it again. Those old Stevens are no doubt strong.

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