Aren't the 5 1/2's small pistol magnum primers?

The Remington 5 1/2 Small Mag Pistol Primers are made with a very closely controlled, specifically formulated chemical mixture to ensure that no matter the powder, ignition is always fast and consistent. The primers are made with a three legged design that gives the largest area for the flash and a bigger striking area for the firing pin. The 5 1/2 Small Mag Pistol Primers are designed and tested to function in extreme temperature ranges from -20°F to +150°F. Each 5 1/2 Small Mag Pistol Primer is produced to exacting tolerances with a deviation no larger than .0003 ounces. All 2 5 1/2 Small Mag Pistol Primers are visually inspected and undergo critical ballistic tests.

Summary

The Remington 5 1/2 Small Mag Pistol Primer is a premier tripod designed flash cup with a larger than standard striking area that ensures positive fast ignition of most all available powders with a weight consistency of .0003 ounces. All 5 1/2 Small Pistol Primers are tested in controlled scientific environments for ballistics performance and quality. The 5 1/2 Small Pistol Primer will perform from -20°F to +150°F to ensure no matter where you use them, they will perform at the top level.

Specifications and Features:

Designed To Perform From -20°F To +150°F
Weight Checked To .0003 Oz
100% Visually Inspected
Tripod Anvil Design Gives Large Flash And Larger Striking Area