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Old June 19, 2011, 11:32 PM   #2
mehavey
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Join Date: June 17, 2010
Location: Virginia
Posts: 2,790
1) Your problem is not the primer (which you won't have any trouble with); it is the powder that is the limiting factor in (very) cold weather .

2) Unless you are near the top end of the load, my experience is that Mag primers do not significantly affect pressure margins at all. (Leave the load alone, especially if/when moving into cold weather)

3) Stay away from ball powders in cold weather. Once you hit the 30's (F), ball ignition/burning characteristics degrade significantly. Varget is supposed to be less temp sensitive, but as Patrick Swaze said, "Opinons vary...."

Last edited by mehavey; June 19, 2011 at 11:39 PM.
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