I was loading up some rounds the other night and decided to weight the batch of completed rounds (around 60) to see what the variance was, I discovered there was up to a 9gr variance across the batch so took the ones that seemed out apart and reweighed the charge which came out as correct.
I then weighted some brass empties and it appears this is where the variance comes in, even in a single brand there appeared to be a 6-7 gr variance, (these were 30-30) so I was just wondering if anyone else weighs their assembled rounds?
The bullets appeared to be within 4-5 grains of each other over 30 samples.
Also, if the brass is sized and trimmed, surely only the capacity could be different which would potentially lead to a pressure difference in the round and potential differences in point of impact? so do you "batch within your batches" for weight?