I've been reloading for almost two years now and have used only Winchester brass for 30-06 and 300wm. I haven't had any troubles other than a few necks that weren't perfectly round, but that is taken care of when I size it. I recently got a 25-06 and bought some new Winchester brass to start reloading for it, but I've found a few problems with some of the cases. The biggest problem is that a bunch of the flash holes aren't centered in the primer pocket. The other problem is that there seems to be some spots in the brass that are kinda stained. Even after tumbling these cases for two hours these spots are still there.