Primers can have a noticeable impact on a load. Like Bimmer said, you're fine with whatever since you're not flirting with max pressures.
I've seen a velocity increase of 40 fps in a .223 load with only the primer as the variable. I think it was Fed AR Match vs Wolf SRM, with the Federal primer yielding the higher velocity.
Another thing to note, "Magnum" doesn't necessarily mean a hotter primer. Wolf SRMs for example have a thicker cup, but are a really mild primer.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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