Always check your scale with a known factor, some scales come with check weights. If nothing else, weigh a 69 grain bullet, it should be within 1/2 grain. Sierras probably within a 10th of a grain.
Reduced charges can be as damaging as too much, easy to get a bulllet stuck in the bore and sticking and firing another one behind it, and at the least it will cost you a new barrel.
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