Blackpowder primers
Similar to what occurs when firing most modern-style firearms, a primer for muzzleloaders ignites a main powder charge.
The two most common percussion cap primers are the Number-11 Percussion Cap and the 209 Muzzleloader Primer. Each is coated with an explosive substance that, when struck by the hammer, creates a spark. The Number-11 Percussion Cap is placed directly on the nipple and is used for caplock muzzleloaders. The 209 Muzzleloader Primer has a much hotter spark and is used where there is a larger amount of powder in the main charge. It is first placed in a primer holder and then on the nipple.
Always consult the owner’s manual of your firearm to determine the recommended primer for your muzzleloader.