Remington Kleanbore Centerfire Large Pistol Primers feature a group of subcomponents assembled to exceptionally precise tolerances. Primer cup dimensions are controlled to four decimal places. The priming mix is specially formulated for consistent ignition with a wide variety of powder types, and is tested for reliable ignition over a temperature range of -20F to +150F. Individual primer pellet weight is controlled to .01 grams. A unique tripod anvil design creates a larger sweet spot with maximum sensitivity - even with off-center firing pin strikes. And lastly, each lot of Remington Kleanbore Centerfire Primers are 100% visually inspected and subjected to critical ballistic tests. Consistent ignition with a wide range of powder types Reliable ignition from -20F to +150F Unique tripod anvil provides maximum sensitivity Pellet weight precisely controlled Metallic dimensions controlled to .0005