Hesp
40 Cal
Lyman Great Plains 54cal percussion. Lee 300GR REAL. 120gr FF black powder substitute powder. CCI percussion cap. Haven't fired this rifle for about a year. Last time I fired it, never a problem. Now , a lot of miss fores. or delayed fire. Tried two different nipples, squeaky clean with carb cleaner. Also insude drum & hole into barrel. Clean!!! Thought powder was too old.. Opened a new , recently purchased bottle of Tripple 7 FF. No difference. Firing just the cap, seemed to be ample force out of the muzzle. What am I overlooking.. Never before had a problem like this. Perplexed..