best bet is to start off with 90 to 100 grains of powder and the bullet for the type of game you may be hunting.
If you are not hunting and just shooting then less powder to start is good.
Check your patches for residue. If the powder is not burning make adjustments. If there is an issue with bullet weight make adjustments.
The triumph is a gun I wish to purchase down the line.
I own a black diamond and it is very very accurate with 100 grains of FFF pyrodex, 777 209 primer, 240 grain hornady .44 cal and green sabot. At 100 yards all three shots starting from a clean barrel 1 in to 1.5 in spread.