The Winchester '76 were sold mostly in 45/75. I believe it was designed for the M-1876 because the 45/70 was too long for the action. I don't know this for a fact, but I believe the weight of the bullet was 350gr. Ideal #456192 was the correct bullet mold. If he has dies and had someone make a mold, filled the case with BP or eqeivelant to the point slightly above where the base of the seated bullet he probably would have a safe load. That is if his shooter, presumably a model '76, is in good condition
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