I have worked on 452's and a 455 to get better accuracy out of them. I have worked on triggers, Glass Bedded actions, and Done some barrel lapping to improve accuracy.
The new gun to look at for a reasonable 22 LR is the new CZ 457. I ordered one and picked it up Friday. It looks good, Has 700 Rem. style safety on right side of reciever, Not on bolt. has adjustable trigger for over travel, Sear engagement, and let off weight. The barrel is free floated and it has Aluminum Pillow Bedding. The story is they are lapping the bores too. Barrel attached with CZ 455's angled set screws for easy switching if desired.
I picked up my CZ 457, I had ordered about 3 weeks ago through a local store. Out of the box has the best trigger I seen in a while, 2.5 lb. By RCBS trigger scale. I mounted a Leopold VXII 6X18 X40 on the rifle. UPS dropped a package last night with a brick of Eley Subsonic HP and 1000 CCI Subsonic HP. Now to the range to put it through its paces. Report later.