Similar to what occurs when firing most modern-style firearms, primer for muzzleloaders ignites a main powder charge. The two most common percussion cap primers are the Number-11 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 Cap is placed directly on the nipple. 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. Consult the owner's manual of your firearm to determine the recommended primer for your muzzleloader.
209 Muzzleloader Primer & Holder
Used for inline muzzleloaders
#11 Percussion Cap
Used for caplock muzzleloaders
FFFFG Priming Powder
Used for flintlock muzzleloaders