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You don't need fillers or card wads with AP70 it is over 60% full case, AP70 is quite a dirty powder, and you don't want to push the pressure to high in a 1866
the design is for black powder even with modern materials it is not any stronger than an original same with the 1873 Winchester copies
Best is Trail Boss it's pressure curve is the same has black powder.
60%?? Didn't look anywhere near that maybe 25% could be worng but looking by eye
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