This may sound a bit radical and I may catch hell for it, but I have almost completely eliminated all of my “regular” primers. I use almost exclusively magnum designation primers. Loads that I started with using standard primers many years ago and they were very accurate, I have stayed with standard. Maybe because of superstition!!!!...
If I am use a powder that magnums aren’t listed for, so what. If I start low and work up the differences in primers will be outweighed. My opinion…
That way, if magnum primers are recommended, they are being used anyhow…
I have done that with shotgun, rifle, handgun and whatever else (is there anything else?)…
Reloading manuals are GUIDES and that is as far as I am concerned…
NO, I don’t go over maximum, ‘course Trail Boss is an exception as the 70% formula takes you over published data, but I have never had a problem with magnum primers…
Much literature indicates that some manufacture’s standard primers are “more powerful” than some manufactures magnum primers. So be it...
Let’s keep this reloading hobby simple. As one ages, this becomes more apparent…
Good-luck…BCB