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Message: <blockquote data-quote="Glock 40" data-source="post: 3388312" data-attributes="member: 32">I haven't run mp in any 9mm yet.  I read a lot about it for 38spc though and the consensus I found is that they don't burn hotter they burn longer.  Also some like Remington have a harder cup.   For example Remy says use a 5-1/2 for .40 to get the harder cup vs 1-1/2s.   I have seen lots of guys talk about using magnum in cold weather on very light loads for a more consistent ignition.   I am sure with some googling  you can find guys who run them in 9mm mp only. I never run anything in a die till its been tumbled.    After tumbling then I run everything through a LEE app normally for de-priming.   Then final inspection before loading or swaging if necessary.</blockquote>