Hello everybody. I'm a newbie here...been lurking for several months, but anyway I had an FYI to warn you about. Just last night I was working on a new batch of 100 Winchester .308 Win brass and found eleven cases that were 20 grains heavier than the rest!!! That's right, twenty grains heavier. All external deminsions were good/normal, but these cases were very thick and had less internal capacity. The other 89 cases only varied about three grains. I don't have the lot number, but can tell you that this brass was purchased from Midway last month so it should be fairly recent production.