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Old June 29, 2012, 01:02 AM   #23
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,022
Thorn74,

Not only can you use magnum primers in the Garand, they are the preferred primer for the Garand. You got the right thing. As mentioned earlier, military primers are all magnum.

The reasons for the magnum primers is three-fold: First, the military feels they get better low temperature ignition with them. Second, large rifle magnum primers are sometimes a bit less sensitive than standard primers, and that can help resist slamfires in the Garand. Third, the .30-06 case is a bit large for the powder burn rates that are best for the Garand op-rod. As a result, many Garand loads have a fair amount of empty powder space left in the .30-06 case. Magnum primers make more gas than standard ones do, so when there is a lot of empty space, they do better at achieving adequate start pressure for consistent ignition. As a result, Garand loads often see less velocity spread with magnum primers because they make ignition more consistent in the presence of that extra empty space.
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Last edited by Unclenick; June 29, 2012 at 10:17 AM. Reason: typo fix
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