Sthrnhogbuster
Where do you live that 5-6 " group might work somewhere a normal shot is 50 to 60 yards. But the thing is are you happy with it, must not be if you are looking to adjust the trigger to tighten your groups.
I have not been shooting mzleloders long but I have been shooting CenterF for years.I posted some pics here.
copper fouling?...........................Oh wait I have a brass range rod.
sabotloader posted a targethis is a good example of shooting my pic the one at 100 yrds peep sight, is a 3 1/2" to 4"and it needs work I know I can do better with a different combo bullet powder measure or powder. I just need to dial it in. Bdeather has shoot some tiny groups with his white lightning If he would ever decide he wants to see how a computer works and learn to load pics they are tight little groups he is shooting.
I am with FG on this one I would look to someone else for advice if it were me.