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Please, I don't want to sound like a jerk but zero is zero what you are really trying to check is span or is the scale measuring the weight accurately.
I have found Hornaday's to be usually within a couple tenths. I would weigh 4 different bullets and if all the weights were consistent and within a couple tenths of the advertized weitht then i would add these weights and weigh all these bullets together. If you are still within a couple tenths then you should be good to go.
Also when you take the weight off the scale and then put the same weight back on does it go to the same reading?
Of course check weights or testing it against a known good scale is better but sometimes you have to make do with what you have.
Hope this helps!
James
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