Primer experiment Recently I had an opportunity to buy 1000 cci magnum small pistol primers. I had some concern about using them so I conducted an experiment. I loaded 20 identical .40 S&W cartridges and put CCI magnum primers in 10 and regular CCI small pistol primers in the other 10. I fired all 20 thru my chrono and the results were: the average of the ten cartridges with magnum primers was 859 ft per second. The average of the ten standard primers was 854 ft per second. I was surprised with these figures and my conclusion is that, in this application, there is virtually no difference in performance between CCI magnum small pistol primers and CCI standard small pistol primers. I am wondering what any of you might make of this information.