Here, I'll save you the heartache. I dont have a clue why so many Inliners cram 3 pellets down the bore, Its not needed!
IMO, i'd ditch the pellets and go with loose powder.
http://www.gbofreeforums.info/ThePowerbeltForum/viewtopic.php?t=4
Hope this helps.
Also, TC doesnt have a good Rep. at shoot conicals. Most get lucky with powerbelts due to the plastic skirt. Wheather your TC will shoot them or not, is mainly up to your rifle and if TC bored your QLA correctly.