You have bigger problems than bullet weights.
Make some of your very best ammo with all the projectiles exactly the same weight & some with the projectiles with weights all over the show, say enough for 5 groups of each.
Shoot the groups & see which has the best average size, make sure you do it in very good consistent conditions otherwise don't bother.
A quarter of a gust of wind you miss or breaking your position will have more effect on group size even with big high BC bullets zipping along than a few tenths of a grain here or there, same with powder weights in big cases
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