I have a couple dozen boxes of handgun and rifles bullets. I have yet to see a single bullet vary more than 0.6gr, and that is out of a very old Hornady 180gr 40cal box. The rifle bullets, I have Hornady, Sierra, Nosler, Barnes and Speer. I have to search through the boxes to find one that is off by more than +-0.1gr, with an occasional example over by 0.3gr, mostly in the Sierra and Barnes.
If you've got a box of 55gr Hornady, the vast majority are going to be either 55.0gr or 55.1gr.
Weigh a few individually. If your scale is telling you anything outside of 54.8-55.2 with any consistency, the SCALE is wrong, the bullets aren't off by that much. If you're consistently getting very close to 55.0gr, which is strongly suspect that you will, take 10 that weigh that amount and weigh them together (assuming the scale goes to 550.0gr). The most discrepancy they should have would be if they were all very slightly over (or under) weight and the errors added up to an extra (or short) 0.5gr or so, 549.5gr to 550.5gr.
This really is plenty close enough for reloading. We're not verifying the International Standard Kilogram here and checking for loss from radioactive decay.
Strictly speaking, your original question of "check my zero" requires no check weights, by definition. When there's no weight on the scale, it should say zero. It's verified.
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