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m&p45acp10+1 · February 26, 2012, 08:38 AM

I am not sure. I have loaded several loads in .223 with H-335 that one manual says use magnum primers, the other says use standard.I would say try a few of both. Magnum primers re usualy recomended for ball powders to get better ignition consitancy. Also sometimes in realy cold weather it takes the magnum primer to ignite the ball powders reliably.

Personaly if it is that cold I am gonna be inside staying warm drinking coffee, and working on my reloading bench.

February 26, 2012, 08:38 AM	#2
m&p45acp10+1 Senior Member Join Date: May 3, 2009 Location: Central Texas Posts: 3,930	I am not sure. I have loaded several loads in .223 with H-335 that one manual says use magnum primers, the other says use standard.I would say try a few of both. Magnum primers re usualy recomended for ball powders to get better ignition consitancy. Also sometimes in realy cold weather it takes the magnum primer to ignite the ball powders reliably. Personaly if it is that cold I am gonna be inside staying warm drinking coffee, and working on my reloading bench. __________________ No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.