With blackpowder it's best recomended to throw out all modern loading data and some balistics and go old school.
Start with your caliber and add ten grains. Shooting low add ten more.
So if your shootin a 50 start at 60.
If you hit 90 grains and you still are playing... Stop.
Most frontloaders shooting blackpowder just burn the powder outside the barrel after 90 grains. It just doesn't burn fast enough to be of any use.
Remember blackpowder is loaded in volume. The grain marks on your measure are not actual grain in relation to modern loading.
I shoot a 54 cal and a 72 cal. I shoot about 75 grains in the 54 and about 80 in the 72. (FFFG)
Both hit very well at 100 yards. But the way I load in the 72 and the design will spin me around. The 54 doesn't even kick.
My father is a very good hand loader and taught me well. But I had a heck of a time when I went deep into the muzzleloader thing.
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