I've harvested a lot of deer with 70 grains of 3Fg from a 38" Colerain barrel and a patched, .530 round ball. :wink:
I was taught that you use some math for a base, starting load, then at the range you experiment using that base, and see what works best.
Ball Weight in Grains / divided by 3 = result is then rounded to nearest 5, is starting load in grains by volume.
So my .490 ball in my .50 was 177...divided by 3 = 59, rounded up was then 60 grains. At the range I settled on 70 grains.
Upped my caliber to .54 a few years later, and the .530 ball was 225 grains so the starting load by the formula would've been 75. I had the 70 grain measure from the previous .50 caliber rifle, tried that first, and it shot fine so kept it at that.
Worked for my .40 too..., the .390 ball is 89 grains, so that's 30 grains of powder when the result is rounded. :wink:
LD