I haven't shot any of the CZ 453 varmints in 17HMR, but I just picked up one of the 452 varmints in .22LR and can't wait to shoot it. If you're looking for any tips on the CZ's, I recommend checking on Rimfirecentral.com or linked here: http://rimfirecentral.com/forums/forumdisplay.php?f=18