The only reason I use one is to keep my primers where I know where they are at in my pocket when hunting. The only one I know that works with the Encore is the one T/C makes that is basically a plastic stick with a primer slid in each end. As the others said a capper is not really needed for priming. I now use a Cash Capper and just pull a 209 out and prime the gun with my hand, but it does keep the caps where I know they are at when hunting.