I believeweighing isthe best way when measuring Triple Seven. Since it's got a little higher yield small variations make a bigger difference. When I switched from loose to weighed I noticed a big difference. Groups that averaged 1 1/2" - 1 3/4" shrunk to just over an inch. It also made bullets that I had considered unshootable now shoot inside my minimum accuracy preferences. I never tried it with Pyrodex so I have no idea if it would make a difference there. I never had accuracy problems with Pyrodex, although I never hunted with loose Pyro even though I experimented with it.