Remington centerfire 9 1/2 magnum rifle primers is 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 tested for reliability. A unique tripod anvil design creates a larger “sweet spot” with maximum sensitivity, even with off-center firing pin strikes. Features reliable ignition from -20 degrees to +150 degrees, pellet weight controlled to .01 grams and metallic dimensions controlled to .0005.This primer is compatible with large magnum rifle calibers like 270 WSM, 300 RUM, 264 Win Mag and more.