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If I wanted to shot 90 gr of blackhorn 209, why would I not weight out 90 gr on the scale, why measure 5 by volume then take an average if I know I want 90 gr?
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First, you need to understand that for muzzle loaders,
all black powder substitutes - Pyrodex, Triple 7, Blackhorn 209, etc. - are loaded by a volume measure that is based on the weight & volume of FFg black powder. As
Cayugad correctly stated, if you weighed out 90 grains of FFg black powder, then poured it in any of the standard volume measures, the 90 grain weight charge would fill the measure right up to the 90 grain volume mark. That's not true with the substitutes for black powder - they all weigh less than black powder. But we still must use the black powder volume measure for them.
So, if agun's manual says you can use up to100 grains of powder, it means you can use 100 grains volume of black powder (which weighs 100 grains),or 100 grains
volume of Pyrodex (which actually weighs around 80 grains),or 100 grains
volume of Triple 7 (which actually weighs around 78 grains) , or 100 grains
volume of BH (which weighs something less than 100 grains of black powder).
Think "volume equivalent" and you'll be on the right track. If your gun is designed for loads up to 150 grains and you use 150 grains
actual weight of BH, you will be grossly overloaded, perhaps to a dangerous level.
If you want to weigh charges, do as
Cayugad said. Measure out five charges of 90 grains volume in your measure, weigh them, average the weight, and use the average weight as your 90 grain volume equivalent charge.
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