I have a Navy Arms cylinder bored 12 ga double.
I was able to find a muzzle loading shot gun kit from Cabelas thanks to a very good customer service guy a few years ago. It had all the wads plus some hard plastic shot cups. It called for splitting the shot cups but I left them solid.
I got a good pattern out of them out to around 25 yards using #6 lead. Seeing my Navy arms had modern steel barrels I used the shot cup and shot equal measures of pyrodex and shot. If I remember right the shot cup held right around 100 gr of powder.
I tried to use regular reloading shot cups with the bottom cushion cut off but all I could find were shot cups that were split. If I tried to tape the shot cups I would end up with oblong patterns.
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