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I use Winchester magnum primers if I cannot get CCI No. 34. Non-magnum primers will flatten...even w/ mild loads. I found this out when I did few that were middle of the load range. But no primer corners spilling in the groove. If the cup spills over into the groove, you may want to reduce that load.

Otherwise, i just stick to CCI No. 34 or Magnum primers.
 
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