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Message: <blockquote data-quote="HiredHand" data-source="post: 2706225" data-attributes="member: 2469">"Magnum primers are "hotter" than standard primers. CCI/Speer typically recommends that magnum primers be used with ball (or spherical) powders, when loading magnum or other large capacity cases, and when it is anticipated that the cartridges will be used at temperatures below 20 degrees F. Ball powders are generally harder to ignite than flake and extruded powders and magnum primers are often called for, even in non-magnum rifle and pistol cartridges. Let your reloading manual be your guide to primer selection."source: <a href="http://www.chuckhawks.com/primers.htm" target="_blank">http://www.chuckhawks.com/primers.htm</a></blockquote>