Early on in my reloading, I experimented with a lot of different \”substitutions\”. Way pre-web and mainly out of curiosity, not necessity. I had revolvers so I had not FTF problems with rifle primers in pistol applications. Didn\’t have a chrony at the time, but found very little noticeable difference. Of course as with any change I did another load work up and only substitution I didn\’t do was large rifle in large pistol applications (large rifle primers are .008\” taller than large pistol primers. No problems substituting magnum primers for standard primer, but my results were from a new load work up. Don\’t know where I learned it, but \”Reloading 101\”, do another load work up any time a component is changed…