To take the discussion a little further;
The type powder you're using, the climate you're using the rifle in, and specfic bullet weight, powder, climate combination can dictate primer needs.
The CCI #250 primer (magnum) is, in my experience, about the same as the Federal #210 (non-magnum primer). The Federal magnum primer and Winchester Magnum primer are very close in performance, as are the Winchester LRP and Federal #210.
My personal guide lines are this:
Small cases (.308wcf and smaller); Extruded and spherical powders- Standard
Larger cases (.30/06, ect) extruded powders, standard
spherical powders- BLC2 and faster, standard, H414 and slower-magnum
Magnum cases; .257wby and smaller-extruded powders IMR4350 and faster-standard LR,
All others (ie:larger) magnums; Magnum primers......
Any of the above combinations used with slow powders/light weight bullets may benifit from a hotter primer.
If used where weather conditions dictate temp's below 30degF, use of a Magnum primer may be advisable. IE: I'm loading a .338Marlin Exp. with LVR powder. I tried some rd's with Win LR and Fed #215 primers. At 90+deg temps, there was no observable difference in velocities, or accuracy.
I placed the rifle in a case, and ammo in my freezer over night. Shot them through my Chron'o on the back yard range. The velocities of the #215's were 30-55fps faster than the Win LR primer. The #215's were only 20-30fps below 90deg temp velocities.
This is only "anecdotal" data, but it tells me which direction to go on MY ammo.
btw -Freezer temp was about 10degF.