LRH is an awsome resource for all things long distance, rimfire included. Example: reading wind does not only apply to center fire rifles.
Another good resource is Rimfirecentral.com They have a forum dedicated specifically to CZ rifles, predominantly the 452s and 453s are discussed.
My dad's 452 varmint is routinely capable of pinky-fingernail-size 5-shot groups at 50yards with quality ammo, more especially Wolfe Match Target and Match Extra.
EH