Well what I plan on doing is measuring the visible area of the overshot card after its roll crimped to see what diameter stamp I need. Then decide what design to use I've seen many different kinds of overshot card markings. My personal favorite are the ones that have the shot size payload weight and powder type. You can get custom ink stamps made for $10-20, not that expensive as I only need a few for the 8 gauge. Eventually I will tackle doing the 10 gauges but they don't get brought out nearly as much as my 8 gauge since it's mostly what I carry when hunting. Oh I almost forgot what kind or color of material you want to use, from my eyes alot of the original overshot cards look like some sort of manilla color though I have seen some old Winchesters with a very bright green card. So I suppose it's up to personal preference.
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