I work up loads for any powder slower than H4831 and cases 06 or larger with magnum primers first. I can then switch to a standard primer with minimal load work up as the mag primer usually though not always will have a higher pressure at least in theory.
No rhyme or reason as to which will be more accurate. I do see more consistent velocities with the mag primers with some load combo's.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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