I have a CZ 452 american. Love it. Pulled up on a crow a few days ago at 60 yards... miss. this is unusual, put it on paper yesterday, a full 2 inches right, and an inch low, from my 50 yard zero... My mounts and bases are solid.
The .22lr doesn't lose zero more than anything else. I would look into the scope for issues. Did the gun fall over or get bumped? What shope are you using
Yes, I always use the same ammo. Wolf Match. I guess I bumped it really hard or something, I have had slight zero change before but this was significant. To be honest, my rings are cheap. That is most likely my problem. Im running a bushnell tactical 3.5x 15. Which I think is perfect for this rifle. I probably need to upgrade to the full lenght rail and better weaver style rings.
Yep go with a one piece rail and bed it if need be. I would also lightly lap cheap rings but only after the rail has been bedded or confirmed true. Don't over torque anything and you should be GTG.