I understand they black powder is measured in volume but for the sake of it we're just going to call it grains with the standard measures on the market now the little plastic ones with the numbers up the sidethey say if you are using triple 7 you are the reduce it by 15% to 20% if you're using to ffg you reduce it by 15% and if you are using fffg you reduce it by 20% show if I measure 80 grains that's equal to 100 is that correct