Put a 168 gr. Sierra HPBT Match bullet on the scale...it should weigh 168 gr. No kidding, we found these as accurate at the calibrating weights....
Ingwe
+1 on that. Most bullets will weigh + or - .1 or .2 grains from where they should be. I used to weigh bullets until I realized it's waste of time. It did tell me that my scale is close enough though.
As far as lube goes. NO NO. It's not needed. Just squeaky clean on the pivot points is what I do. Don't leave your scale exposed to air forever. Cover it or put it away when your done using it.
A far as the difference in loads, look elsewhere. Different lots of powder, different components etc.. The chronograph is also where I'd look at for errors before your scale.
If nothing else, buy a set of check weights, if you really doubt the scale. I don't think that's where the problem is though.
fish head
