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Assuming the bullet fits the bore, the base accuracy of a bullet is how closely the rotational center of gravity is to the physical center of the bullet. If there is an off-center void in the lead core, the imbalance will cause the bullet to move laterally with each revolution after it leaves the bore.
Since there is natural variation in the manufacturing process, how do you know what a reasonable variation should be?
If you're shooting 3" groups at 1000yds, you can't tolerate much dispersion, so you justify $3/ea bullets. But if you're happy with 3" @200yds?
I'm not knocking weighing bullets - I just don't understand the benefit (kindof like uniforming primer pockets).
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