Scale calibration check weights
I have a small set of RCBS check weights and it is amazing how much the price has climbed in the past twelve or 15 years.
Nowadays, if I feel the need to check calibration of my scales, rather than dig out the weight set, I reach up on the shelf and take down a box of Sierra or Hornady match bullets. I figure if three to five each of MatchKing .30 cal 168 gr and .223 cal 55 gr. weigh within plus-or-minus two-tenths of a grain (0.2 gr) I know two things:
First, my scale is dead on, and,
Second, these are very uniform, high quality bullets.
Best,
Johnny