I used to weigh and segregate bullets out of need - not uncommon to find a bullet or two per box that was up to 3 or more grains above or below the average weight. Not anymore, the manufacturers have weight continuity very good, now we are looking at tenths and maybe a total of one grain vaiation between high and low in a whole box.
The bearing surface thing is also something we should not have to be concerned about, but it is there. Bullet making presses have something like 17 punches or dies, that many bullets per stroke. They are not exactly the same, different wear etc. Interesting that virtually every manufacturer makes bullets with the same basic machine, all gov't surplus stuff that has been re-built and modernized.
Segregating by weight, meplat tuning - whatever, it is all part of the fun - unless we get so tied up in it that it is not fun anymore...
Hope your new rifle is a dandy.