rodregier
Member
I don't use the brass Winchester primers in military pattern rifles with free-floating firing pins (AR15, M1 Garand, M1A/M14 pattern) because of concerns about increased primer sensitivity. I used the chrome plated Winchester primers when they were still available. Production on those ceased around 1999. I have now switched to CCI rifle primers (various) for this application. I would not dream of using any of the Federal primers for this application.
The best primers to use for this application are the CCI primers designed to match the mil-spec primers for sensitivity, but they can be hard to source.
http://www.cci-ammunition.com/products/primers/primers.aspx?id=30
CCI® No. 34 and No. 41 MILITARY RIFLE PRIMERS
Military-style semi-auto rifles seldom have firing pin retraction springs. If care is not used in assembling ammunition, a “slam-fire” can occur before the bolt locks. The military arsenals accomplish this using different techniques and components—including different primer sensitivity specifications—from their commercial counterparts. CCI makes rifle primers for commercial sale that matches military sensitivity specs that reduce the chance of a slam-fire when other factors go out of control*. If you’re reloading for a military semi-auto, look to CCI Military primers.
*Effective slam-fire prevention requires more than special primers. Headspace, chamber condition, firing pin shape and protrusion, bolt velocity, cartridge case condition, and other factors can affect slam-fire potential.
The best primers to use for this application are the CCI primers designed to match the mil-spec primers for sensitivity, but they can be hard to source.
http://www.cci-ammunition.com/products/primers/primers.aspx?id=30
CCI® No. 34 and No. 41 MILITARY RIFLE PRIMERS
Military-style semi-auto rifles seldom have firing pin retraction springs. If care is not used in assembling ammunition, a “slam-fire” can occur before the bolt locks. The military arsenals accomplish this using different techniques and components—including different primer sensitivity specifications—from their commercial counterparts. CCI makes rifle primers for commercial sale that matches military sensitivity specs that reduce the chance of a slam-fire when other factors go out of control*. If you’re reloading for a military semi-auto, look to CCI Military primers.
*Effective slam-fire prevention requires more than special primers. Headspace, chamber condition, firing pin shape and protrusion, bolt velocity, cartridge case condition, and other factors can affect slam-fire potential.
