I have the TC Triumph and shoot 2 pellets or 100gr of 777 with a 250grain shockwave unbonded bullet and the factory supplied black sabot.

I tried the three pellets load and found the 2 pellet was the best for me. 2" groups at 100 yards. I am sure I could get some loose powder and fine tune that, but I like the convienence of pellets.

Cleaning: I do a complete breakdown and clean of the rifle after every shot. I start the year / hunt with a clean dry barrel, so I want to know where that first shot will hit every time. I have tested loading 3 rounds without cleaning and did not see a noticeable change in accuracy. The bullet was much harder to load on consectutive shots without cleaning. I would recommend running a spit patch and dry patch down the barrel between shots at the very least. But again, I am more of the one shot and clean for accuracy.

You have a pretty good starter point on your setup. Drop the powder down to 2 pellets and get some range time. Try and make a point to keep everything you do (load, aim, bullet, sabot, powder, cleaning, etc...) consistent from shot to shot. Then once you know where that routine hits, you can change one thing at a time and know the result.

Good Luck and enjoy!