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It is appropriate to use a magnum primer with IMR4350 or slower stick powder I.E 4831, 7828 etc for reliable ignition, additionally I always use a mag primer with ball powder. Cold temps is another reason to use magnum primers with the above mentioned powders, I had a hunting trip to Colorado that didn't turn out well because of my choice of using a standard primer with IMR4350.. FWIW Hornady manual says 57 grs is a max load with their 165gr SST, the only thing I can find fault with you should have reduced your charge of 4350 by a couple of grs when you switched to the magnum primer, reestablished that the 57gr charge didn't produce pressure signs. Anytime you change /switch components you should work up the load again.. Don't get in the habit of assuming all is well when you make what you assume will be minor changes, this hobby doesn't work that way.. William
Last edited by William T. Watts; January 24, 2013 at 09:37 AM.
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