I have just started shooting bp last year with my brothers rifle, a tradions sidelock .50 cal. Every thing worked well, no problems so I bought a .54 cal hawkens by Invest arms this year. I am real happy with it, shoots great. My question has to do with my brother-in-laws guns; one is a traditions .50 deerhunter and the other an investarms .50 hawkens. the guns have been thouroughly cleaned but he still has several misfires during hunting season. In order to get the rifle to fire he generally has to pour some powder under the nipple.I have watched him clean the guns and load them and to my best knowledge I believe he did everything right. He is using Pyrodex rs and it is older powder but was in a sealed container. The powder I got with my rifle was ten years old and when I went to the range I shot over 50 times and never experienced a single misfire. could his problem be his powder? or what?