I just have a cheap scale from amazon.... it weighs to 0.1 gr.... It came with a pan and other than on really large bullets I weigh 10 at a time to get an average weight.... If I was sorting by weight (which I don't), I would find a weight range that includes 90% of the bullets and then discard (remelt) only the outliers.... In theory that should only be light ones that are wrinkled or have an internal void or inclusion, but in reality you sometimes find a few heavy ones, I have no idea why....

Remember, a 2% difference in weight will only cause a 1% velocity change, which will not cause any noticeable difference in POI at 100 yards.... At really long ranges (eg. 500 yards) the slightly higher BC of the heavier bullets will actually cancel out the weight difference.... I have never worked out that for an average RN pellet, but it would not surprise me to see that BC advantage working to make pellets of different weight (but the same shape) hit virtually the same POI at 200 yards....

On a 25 gr. pellet, 2% = 0.5 gr.... Most factory tins do NOT have all their pellets within that range.... If the shape was the same, a 25.2 gr. pellet would have a 2% higher SD than a 24.7 gr. pellet, so also a 2% better BC.... Starting from 1% lower velocity, you can see that at some distance the higher BC would allow the heavier pellet to drop less than the lighter one.... In this example, they are equal at 275 yds.... and only 1/4" different at 100 yards....

Bob