Brian, Your story could probably be repeated by others on this site (I hate to admit this but I been there a couple of times...). Seems that at one point in our reloading life we just have to get as much velocity as possible. I believe that your rifle told you that enough is enough, before things really let go. Did you get a 0.210" black circle burned into the face of your bolt around the firing pin hole? That is a permanent reminder that we went too far. Sometimes a person has to give his head a shake and ask what it is that he really wants. Accuracy should be the most important objective but getting accuracy and the full velocity potential of the case is also nice. Hot-rodding that accuracy limit is always a tantalizing notion - "if the book says 3000 is max and I am getting 3150, then I'm getting free performance!" That might be a fact but brass can only hold so much, and we will probably pay the price when our cases only last one or two loadings. Your story also indicates that some other "reliable" pressure signs can't be counted on - such as increased pressure required to lift the bolt and circle marks on the case-head from the ejector plunger hole. If a person feels the need for more velocity then we should bite the bullet and go to a different cartridge. Your little error was an all too common one, welcome to the club. Blown primers happen. That is one level of boo-boo. There is another level where people get hurt and that is what we really have to stay away from.