I have the 452 Trainer, Ruger 7722 and an Anschutz MPR64.
The CZ has been bedded and has had a trigger job. The Ruger has been both glass bedded and piller bedded and a trigger job. The Annie is stock.
With the right ammo, the Ruger and CZ hang right with the Annie at 50 yards. The Annie IS picky. That rifle shoots pretty good with Norma TAC, SK Std, Center X and Wolf Target. The trigger is so light that I have dialed as much pressure as I can. As received, it was about 6-8 oz. Now it is about 1 lb. I wish I could put a little more in it. I have a Vortex FFP scope on it mounted on a Picatinny rail.
I have Picatinny rails on the other two rifles but am using Nikon P22s on them.
The triggers on the Ruger and CZ have been worked on but are not after market triggers.
The Ruger and the CZ are not picky about ammo. They shoot fine with just about everything. All the rifles shoot better with ammo running about 1100 fps than they do with the high velocity stuff.
Hope this helps. If I was shopping for a rifle today, I would really be looking closely at a CZ 455 heavy barrel. I am impressed with the 452 I have and wonder how much better the gun would be with a heavy barrel.