Tuning TX200 HC Inconsistencies

Thank you everyone for your help. I think I got the issue resolved here. I used some Kroil, JB bore paste, and a mop to go to town on the very beginning of the rifling. Pellets are now loading smoother and groups have shrunk down.

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The pellets are not keyholing here, the backboard is just pretty heavily chewed. Three shots hit center and one to each to the sides. I have some pretty unpredictable winds blowing through right now so I am happy with this as of right now. Hopefully the wind calms down so I can verify the repair.

Edit: got another chance to shoot it. Still absolute garbage groups.
 
Do shot at closer range, mabey 30 or 35 yards to actually check rifles accuracy. While you may end up at 50 yds, atbthat distance there are to many "what ifs" to be sure, things like wind that you cant notice, or thermals in summer heat that can cause flyers. Use the closer rangs to get your rifle dialed in, then move out!!!!

You make some excellent points there that I hadn't considered. Thank you!