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Yes the best killer of primers is water, I once stored a cartridge box of 100 primed cases in the garage over winter all 100 were duds come summer, oil WD 40 CRC 556 don't have any effect short...

I have a Hornady hand primer does a good job the Lee is ok but you need special case holders and I have worn out 3 cams on mine so gave it to a friend, also prime on my Dillon 550 if it is set up...