Just like the picture on Dr. S thread, the Remington tin says, PERCUSSION CAPS, not percussion primers. Most all primers function by hitting it with a firing pin (percussion) but not all primers are percussion caps. (209 primers used on in-lines are properly called primers.) This misnomer is being used by a lot of newbies. Even the employees at gun shops get confused with the terms. I'm not just being picky. I'm being concise. Someone experimented with a muzzle loader fired with electronic ignition. A conventional muzzle loader "might" go off electronically if hit by lightning. My favorite percussion caps were the RWS which I haven't found in the states for well over a decade. Hate to think how expensive it would be to order from Germany. Not sure how much 33 euros translate to dollars and cents, U.S.