I had the misfortune of purchasing a bad case of 1999 manufacture Q3131.. it was nothing but problems, blown primers, fte's... it was a nightmare. Next time the Winchester boys came around, I tastefully let them know my displeasure with their product.. They gave me this phone number.. 1-800-356-AMMO, which is a number at Winchester. After negotiating the numeric options, I was connected with a super nice woman who took down my lot number, told me she was sorry and asked for my address. She advised that they would have ups pick up the remaining defective ammo (like 1/2 a case) and would ship me a replacement case. I was kinda skeptical at first but low and behold, about 2 weeks later, appeared a fresh case of Q3131A manufactured 06/2002 along with a letter saying "they trust I will find the replacement entirely satisfactory"
Needless to say.... I am ;) It breathes fire out of my colt m4 hehehehe..