RE: Best Loads for Black Powder Shotgun
You need to spend some time at the range - I use 100 grains pyrodex - 1/2" over the powder wad - a BP tuff shot cup - 1 7/8 ounce of #4 copper plated lead shot.
Now this has been the most effective - best patterning load for me.
I have a 10 Ga side by side Pedroselli.
Do NOT exceed the manufacturers recommended powder load.
Shot cups (google BP Ballistics they have a huge selection) did help greatly with my patterns.......But taking someone elses load is NOT the thing to do - you need to find the load that will pattern the best in your gun as each is different.
JW