4 years ago I was looking for a bolt action 22lr to shoot indoors during the cold months, I bought used CZ 452 varmint, great rifle & very accurate, shoots one ragged hole group using Wolf match target, standard velocity. Just love the rifle, built like a high powered rifle. The bore is tighter then most 22's had to use a 20 cal. one piece cleaning rod. Maybe the reason why they are so accurate. The 455 is the newer version, will last forever. I order the 22's from Champion Shooters Supply.