Also, does black powder measure [weigh] the same as reloading powder.
No to Measure,,Yes to weight; Please Read;
Dry powders are weighed by "Avoirdupois Weight". There are 7000 grains per pound. The opposing weights of measure using "grains" are the "Troy Weight" and the "Apothocaries Weight" each using 5,760 grains per pound.(K?)
Now,,the standard set to "Volume" measures was, I believe set back in the late 1850's-1860, using at the time, available 2f grade black powder. The stuff was purty much made the same and widley available,,I think they called it the Civil war era.
If you look at the modern propelants,, it will say ""Equivilant too" XX amount by volume black powder."" So if you pour 80 grians by volume of 2f BP on a scale it should say 80 grns. Because t7's say's it's 15% better than BP,,80 grns of t7's 2f by volume should tip the scale at 92grns,, :-D , get it :?
((p.s.) I do use a "custom" made antler tip volume measure. I think my friend "Doc" made it to 65 grains,,after I filed and whittled,,it'll toss just under 80 grains weight of my powder to my .54)