I use magnum primers behind ball powders like WW760 and H450 in most cartridges, as a matter of habit. Just yesterday, I was loading up some .243 cases with these two powders; I employed Federal LR Mag primers.
One of my favorite loads in the .22-250 features WW760. I've found that standard primers give better consistency over Magnum primers here. But in more capacious cases, I routinely use magnum primers, but only because all the experts and manuals recommend them.
Apparently ball powders are a little difficult to ignite, thus the recommendation of higher brisance primers.
"For every complex problem there is an answer that is clear, simple.....and wrong." H. L. Mencken