You got me to thinking now, uh-oh, that usually costs me money.
Anyway, I tried to load 40 grains of fffg goex a couple of weeks back and couldn't get the ball seated below the mouth in a couple of chambers. The way I pour my powder may have something to do with that. I use a brass pistol measure and a funnel to pour into the measure slowly through the funnel. Could that be letting the powder settle too tightly in the measure so that I actually may be measuring more than 40 grains?
The part that costs me money is that I'm thinking of getting a scale after Christmas to weigh my big charges that I leave loaded for a couple of weeks at a time.