I just sat down to get serious about loading a batch of .358 Norma Magnum and as I was seating primers (CCI 200) with a RCBS hand primer tool, many of the primers just slipped right in, very little resistance until the last few hundredths of an inch or so. Well, that started me to be concerned but I went on to charge the first round with 74.0 grains of IMR4350 and then seat a Nosler 225 grain AccuBond. When I removed it from the press to measure overall length I found that the primer was pushed out a little. So I got out the hammer bullet remover and when the done its job I looked at the case and the primer was back in the seated position. These cases were bought at a gun show and loaded and fired once since several years ago. I can't find my load info at this time but it was taken from a manual and was below maximum. The rifle is a rebarreled 1917 Remington Enfield now with over a hundred rounds through and I have never noticed any other signs of overpressure. I am afraid I have a pile of very expensive scrap brass less than two weeks before I return to The Great Land having been invited on a moose hunt this fall. I will check out the once-fired factory round that I fired and see how the primers seat.