Home Forums Reloading Varmint Rifles SOooo, Didja Know....

There is a Primer faq on the CMP forum that:

NOTE 1:** According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size.** Both primers use the same cup metal and share the same cup thickness.** Both primers use the same primer compound formula and same amount of primer compound.** They can be used interchangeably.

Primer FAQ