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ID this 410 shell.

I got this in a box of parts. It is a steel cased 410 shotshell. It measures 2 3/4 inches long. The head is stamped '410', '70', and another stamp that I can't identify. The plastic (?) wad is stamped with a '3' ( #3 buckshot?) A magnet sticks to it so I know it isn't aluminum. Any info will be appreciated.








Comments
Your description of the head stamp, the way that it's dated. Makes it appear to be for the military. But the steel case throws me?