when I first started shooting bp someone once told me maximum grains was twice the caliber, this seems a little light to me as iI have occasionally shot 120gr out of my fifty cal renegade, maybe occasionally is the key word, put a white sheet out in front of the bench you are shooting from if the load is to big there will be unburned powder on the sheet, just back down till all the powder burns, or up till it starts blowing out unburned powder that would be maximum efficient load. anything larger and you are just wasting powder.
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