Air Arms Sighting in TX200HC after relube

Nice shooting Chuck.
I was also shooting my Tx, getting ready for the cup @ Ohio.

I was getting unexplained flyers for the last two days.

I probably did the same trouble shooting you did :

1. Check all screws. Especially that front bracket screw that secures the bracket to the action.
2. Chrono to see if there's was a spring/seal/action issue
3. Clean barrel (not something I do routinely…maybe once every two years or when I cannot group)

One of my buddies suggested that I switch pellets. DING DING DING.. I accidentally shot a tin of JSB head size 4.53 …the barrel did not like this head size. I bought different head sizes 6 months ago to do testing and totally forgot about them. It becomes problematic when you shoot from a pellet pouch and not from the tin.

I Switched back to a 4.52 head size, the accuracy came back.

Took 2 hours this morning to pin point that this barrel only like 4.52 head size.

Oh …I also lightened my trigger a bit. I found out that my trigger control is more consistent with a lighter trigger.

I haven’t done lubing as an intervention yet. I might need to look into that.

The 4.5x size marked on the JSB/AA tin label is nominal, and has no bearing on the diameter of the pellet head nor skirt.

The important information is the die number, and date of manufacture. If your rifles shoots best with a particular die and date, buy as many as you can.