Yeah mine definitely likes 40 gr better as well. But I still get good accuracy with Aguila 38 gr, CCI 36 gr and Federal 325 rd value packs which are 36 gr.Ive always had better performance with 40 gr out of pistols. my guess is there’s something with that lighter projectiles the tx22 doesn’t like. The rifling on my tx22 also looks gnarly. I run the same ammo all the time (aguila 40 gr) and CCI std velocity 40 gr.
Be interesting to see how it shoots a newer brick of Federal 550 I got at Walmart last year.
The rifling on both of my barrels seem normal as far as I can tell. I got lucky I guess.