I have the TX200HC .22 Walnut, this thing is dead nuts accurate. It's favorite pellet is the GTO 11.7Haven't shot for chrony numbers but will. 55yds 5-7 shots covered by a dime most times, other times easy nickel. So the 1" groups are easy to shoot. That being said I have ordered a Pro Sport .177 Walnut this way I'll be covered either way 😃 John in PA should be getting to her soon. John has been covered up with tunes, no hurry since we traded my RWS48 .177 for his HW77 .22 (GTO) ammo loving gun too!!!! Personal preference on caliber since these platforms are very accurate. My thoughts are you can't go wrong with either caliber. Once John tuned my TX200HC .22 my shot cycle really smoothed out, accuracy was always there. With .22 and GTO 11.7 it's like shooting a .177 10.3 JSB trajectory. Best of Luck Brother Man