Charlie, you're the first person who has ever acknowledged the idea of shooting steel in thick shot cups in old guns. It is just no big deal and will not damage a gun that has already been somewhat damaged with minor pits and corrosion. Just keep an eye on the choke area every time you clean the gun. Thanks, Charlie. Another thing that can be done is to use chamber inserts and shoot 12 gauge steel in 10 gauge guns. There is hardly any chance of damage at the muzzle with a 12 gauge load.
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