It's just one of those things, the guy who taught me to reload on a 550 just told me to pull ten cases out of station three and dump the powder back in the hopper, then weight the 11th charge, so that's what I did, then when I was setting up my own 650 it hit me like a ton of bricks: I could just remove the fail safe rod at work the powder throw by hand and I've found that the charge weight doesn't settle down until you throw 20-30 charges, ten didn't seem to be enough.