They are both good rounds, bought a cz 452 17hmr off another forum member late last year. It took a bit if getting used to compared to a 22 lr but now that I've spent a bit of time behind it, hares and rabbits are toast out a long way.
The weekend before last, my brother and I went out on a windy night and missed the first couple of hares at about 50 yards, we soon figured out why. We had been allowing for the wind and once we stopped allowing for wind like we would have had to with the 22 lr, we started dropping everything first go for the rest of the night. We weren't shooting crazy far (spotlighting on a dairy farm), I think the furthest was about 120 metres with the wind blowing about 20 km an hour.
I don't have any experience with 22 mag but I imagine it would perform pretty well in the wind. I think speed helps both of those rounds more than anything.
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