From my 2004 Dixie Gun Works catalogue
This is black powder muzzleloading service load from the Birmingham Proof House dated February 1896
8 Gauge - 135 grains or 4-15/16 drams powder and 1-13/16 ounces of shot
10 gauge - 109 grains or 4 drams powder and 1-1/2 ounces of shot
from another chart in the same book, (source not given, but it compares well with the 8 gauge and 10 gauge ML loads above)
10 gauge 2-3/4" chamber - 109 grains FFg powder and 1-1/2 ounces of shot = muzzle velocity of 1040 FPS
10 gauge 3" chamber - 123 grains FFg powder and 1-3/4 ounces of shot = muzzle velocity of 1060 FPS
Not perfect but I think there's enough data to extrapolate what a 8 gauge shotgun shell load should be.
I hope this information is useful.
Steve
Last edited by Rockdoc; 03/18/12 10:42 PM.