Had an HW97 tuned several years ago and now going to do a TX200 and wanting some feedback as to which pellets seem to work best in these guns. It's a .22cal.
If it's a newer one, try the JSB 7.87's. If it's an older one, AA/JSB 8.4's, or H&N FTT's or Baracuda Match.
Good Luck!
Edit: WHOOPS - I totally missed that it's a 22cal. Sorry, I have no tried-and-true suggestions there. I would probably start with the AA/JSB 14gr, 16gr, and 18gr, and then if those didn't work, go to H&N FTT's or Baracuda Match.
Not every TX will like the same pellet, unfortunately testing iscthe only sure way to know. Stick with popular pellets as they are usually most consistant. You should do a simple tuneup to speed up the breakin process, other wise tour gonna do a lot of shooting and sorting thru pellets. These are quite easy to service and a quick tune with proper lubes can make a big difference in a short time. Mine are .177 so can help you there, but most folks have good sucess with popular pellet brands.
I have had good success with the Crosman 14.3 hallow point, Benjamin Discovery 14.3 hallow point, RWS Superpoint Extra 14.5, and Napier Power Target 15.46. These all shoot good from my TX200. I have shot some H&N Field Target Trophy 14.66 with fair success as well.