Thanks 'Boo.
I did actually load up nine rounds with progressively more powder, three at a time and one grain at a time. But The "hottest" of them is only three grains more powder than the ones I was shooting.
Hmm, it is a nice morning here, maybe I will head over to the range for some more experimenting.....
Doug
PS to Rich) MY flash hole is NEVER clear, back blast area is ALWAYS dangerous.....