You could just use magnum primers for everything and reduce the powder load by about 1/2 grain. I would follow this myself except that I have a notion that some powders actually prefer standard or magnum primers. I believe I read this in Speer manuals. If not I read it somewhere. I didn't make it up. Now whether or not it's true........

PS The consequence of powder not liking the primer is erratic ignition of the powder, reducing velocity and accuracy

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