Anyone ever used these? Picked up a couple of sleeves at a gunshop Monday. Looked like they had been on his shelf for some time. Marked MAX-FIRE LARGE PISTOL PRIMERS on the face of the box and 100 LARGE PISTOL MAX-FIRE on each end of the box. They are placed on end (or on the side) in the box not flat. Much smaller box than CCI or Winchester. The guy at the gunshop said they were the same as Winchester. Any info on them? Are they Magnum or Standard?