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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...

Don't use Large rifle primers the 44/40 is pistol primers only the rifle primer will sit proud of the case, I shoot 7.0 grs in a pistol with 215 gr bullets with out any drama
work up to 7.5 grs I've...