Starline Brass 500 Smith & Wesson Unprimed (Large Rifle Primer) 100/Bag

The Initial run of 500 S&W Mag (R) cases was built to use large pistol primer per Smith & Wesson and Cor-bon specifications. On July 28, 2003, Smith & Wesson and Cor-bon changed specification of primer pocket to be large rifle. Rifle primers are same diameter as pistol except they are approximately .006" taller. This was done to prevent primer from being pierced by firing pin when loaded with max loads and heavy bullets (bullets over 400 grains). It was determined that hole in primer allowed pressure to damage firing pin and bushing, kind of like a cutting torch and the harder cup of a rifle primer will prevent occurrence. All cases sold by Starline, Inc. after July 28, 2003, will contain a large rifle primer pocket to accept a large rifle primer. Hodgdon Powder has generated load data which recommends using Win. Large Rifle Primers.

Cor-bon has also tested and recommends CCI 250 primers (Magnum Large Rifle). Starline new cases will have an "R" after the "Mag" on the head stamp to signify rifle pocket. If you have previously purchased 500 cases without "R" on head stamp and wish to modify, you can use a large rifle pocket uniformer to deepen primer pocket to accept large rifle primers by deepening pocket approximately .006". *This will not affect the integrity of the case.

The above extract is simply provided for Customer convenience. *Since handloading operations are beyond our control, we disclaim all liability for any damages which may result from cartridge case modification.