Join the club. I have shot many loads, powders, grains etc and finally found a good load that shoots good out of my TC. I find that in order to keep it consistant, clean the bore and breech plug every shot to keep every shot the same. Once you shoot once, the bore and plug are dirty and will alter the shots in some guns. My gun now will shoot good shot after shot, but it does shoot about 2 inches higher at 100 clean and died nutz after that. Must be the friction imo.
I shoot a TC omega with 250 gr shockwave superglides and 140 gr Blackhorn 209 powder with CCI magnum primers. Great out of my gun but my friend can't shoot that load out of his at all. They are different animals sometimes. These are just my findings of shooting these smoke poles.