Handloader Magazine published an article by A-Square where they tested different primers with a load in the 7MM ReMag.
160 grain Sierra boat-tail, 66.0 grains of Hodgdon H-4831 and Winchester cases.
Winchester WLRM (magnum)¬___ 3045 fps, 67,600 psi
Winchester WLR (standard) ____ 3024 fps, 64,400 psi
Federal 215 (magnum)________ 3036 fps, 61,400 psi
CCI 250 (magnum)___________ 3039 fps, 61,500 psi
Remington 9½ M (magnum)____ 3041 fps, 59,300 psi
CCI 200 (standard)___________ 3011 fps, 54,800 psi
The SAAMI max pressure for the 7MM ReMag is 64,000psi.
My rule of use is that I use standard primers with flake or extruded powder, and magnum primers with all ball powders. The key is the work up to an acceptable load using those parameters. I use CCI primers in all my rifle or pistol loads, and Winchester 209 in shotshells.
NCsmitty