That .30-40 brass is 'par for the course' in my experience with Winchester over the last 8-10 years. Their quality has gone down hill substantially, and is particularly bad with seasonal run cartridges (.30-40 Krag, .303 British, .358 Winchester, etc). It seems like they send all the good brass on for ammunition production, and sell the seconds as component brass.
Unfortunately, Remington isn't much better.
If you don't want to play the bad brass lottery, you have to stick with better manufacturers (Lapua, Norma, Hornady, etc).