With a crook batch of projectiles. How much of an effect on point of impact would you expect per 1 grain of variation in bullet weight? Example, if a sample of 10 bullets were weighed and the bullets varied in weight from 248.5 grains to 251.5 grains. ie 3 grains variation. How would this effect point of impact at 1000 yards? Be interested to know as I have a few boxes that are just like this and cant send them back.