need some help here guys....i got my 370 grain maxi balls going. started at 70 grains at 50 yards and was shooting good enough to get my sights on...but 3" inch groups are not cutting it using a bench rest....i finished off with 3 rounds off hand and was still in the black, but evenly spaced around the edges at 8 - 12 - and 4 oclock...i'm comfortable my sights are are on....But....now what do i do? raise the powder amount 10 grains and see what happens? is there a procedure for "Working up a load"? does too much powder, or not enough show any tell - tale signs?