Don't leave powder overnight in the plastic hopper of your powder measure, it scores the plastic. To be more accurate, never loan your powder measure to a friend who leaves his powder in the hopper overnight.
If you use the same belling die to bell .357 and .38 Spl cases (or .44 Mag/Spl), be sure to check the die setting when switching from one to other. You don't need THAT much belling on a .357 case.
CHECK the complete wording on the primer box before priming 50 cases of .30-06. Double Check it. Federal
Large pistol primers are
not Federal Large rifle primers.
And when part of your brain still tries to tell you the priming mixture color doesn't seem right, listen to it...
