Depends on what powder you're using. If it's Blackhorn 209 you will need Federal 209A or CCI 209M primers, not any of those designed for muzzleloaders. If you're using any of the other black powder substitutes like Pyrodex or 777 for example, you can use any 209 primer and probably won't be able to tell much, if any, difference. 777 pellets are sugar based to hold their shape and will leave a crud ring in front of the breech plug where it ignites because some of the sugar "caramelizes" at ignition. Hotter 209 primers make this ring a little worse.