Thanks for bringing this up Driller. I was haveing a talk with a older fella at the club the other day and was asking him if he knew what the designation was on those primers. He looked at me like I was wacked and told me Winchester only ever made the standard Win209. I though they were an AA and knew they were in a black box but no one had ever seem there here. I used them with Win 571 for duck loads back then but I guess they were desgined for reloading the black Winchester Handi Cap loads.driller said:Maybe the next hottest I have used was the short lived Win 209AA, they came in a black box and were only around for a short while.