I have a TC Triumph, I found the most important thing for mine was finding the right sabot, I expected it to use the MMP-HPH24 as is commen with many TC guns but my bore was a bit tight for it,when I tried Crush Rib sabots it started going down to an inch with some loads and occasionally under.
What shoots good in mine
Best 200gr SW with 110 777-FF win209
Gold Dot 250 gr with 110 777-FF win209
250gr SW with 90 gr 777-FF win209
200gr XTP 50/40 blue MMP 90 gr 777-FF win 209
300gr SW or Gold Dot with 110gr 777-FF win209
Hope this helps. Lee