I weigh and anneal. With lapua brass there are usually 2-6 outliers, then 2 or 3 batches of close weights , like 0.5 grain spread., this is out of 100 brass on average.
The limited (one time) Alpha brass begot 2 groups ,0.5 grain spread and 3 what I consider outliers.
For bullets I take 20 ,weigh them and then divide by 20 for an average (Berger & Lapua). I just bought some Barnes match bullets, 112 grain 6mm. These I will weigh individually as there seems to be looser quality control as concerned with weight.
A good load (OCW) will tolerate small variances in weights and measures.
A finicky load will respond to minor variances.
For shooting groups at distance (1000 yards) I look for a low ES, as one bad round ( an outlier) can double the group size. Especially if the load responds to slight variations.
