Here's a nice write up: http://www.czfirearms.us/index.php?topic=32042.0

I have 7 variations of 452/3s so I guess I'm a CZ snob. They all shoot very well with my .17HM2 Varmint shooting unbelievably well. With a YoDave trigger kit, they're as accurate if not more accurate than some of my Remington 541 and Anschutz rimfires.

The only production rimfire that I own that seems to be as accurate is a couple of Winchester 52Bs.