This is a new one on me. I have been using Winchester primers, in this case Large Rifle Standard, for many years. I like their consistency. But I have obtained a box of the newer dull brass colored primers, while the ones I've used for so long were nickle plated. Anyhoo, I went to load a batch of 270 Win cases, all of them either once or twice fired, and the primers just slid right in with almost no pressure. I stopped seating them, carefully removed the primers and tried both Federal and CCI primers in their place, having a couple boxes of each. They worked fine, so it wasn't something with the cases themselves. I have never reamed out commercial brass primer pockets, so they are not enlarged for that reason. Has anyone else had this experience?