Ruger is never known for accuracy. Especially the low end stuff. Stock 10/22 is significantly more inaccurate than CZ452/455 in 22LR. if you check out 25 mter sports rifle clubs, many intermediate shooters use CZ, almost no one who is a member uses stock 10/22. I would expect Ruger 17hmr to be slightly better than their 22LR but not enough to close the gap.
My guess is that CZ's craftsmen simply pays better attention and spend more time on each rifle.
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