I had a .17HMR CZ 452 Varmint and my mate bought it's twin for his Son at the same time. He still has his but I sold mine due to lack of use.
Accuracy was great to 100m with the correct ammo, like a .22LR each seemed to prefer it's own type. See target photo, grid lines are 1", 5 shot group at 100m BUT go past that with any breeze and things start to wander around. The tiny light bullets just don't like a breeze yet alone a wind blowing. There also always seemed to be one shot that was a flyer out of five and it was a lot worse with some different types. I was using Federal V-Shok.
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I sold mine as I found my CZ 527 .22Hornet more accurate with much longer legs using 30gr Bullets even with a bit of wind. Also, not much difference in generated noise.
Ammo in my view is the .17HMR's downfall. CCI make most of the ammo for other brands like Remington, Federal, Hornady and a couple of others. Winchester is one that make there own. The problems with the ammo was and I believe still is a fault in manufacturing with split necks and worse split shoulders which allow moisture contamination of the powder inside. The warning still applies, check every cartridge for splits before loading or you risk a misfire lodging a bullet part way down the barrel, worse still if you don't pick it up and fire another round.
If I'm going somewhere to varmint at around 100m I'll take my Brno Model 2 .22LR or if it's further and Fox is on the menu I'll take the .22Hornet. The .17HMR wasn't in my view all that cheap to run and the ammo from box to box, perhaps batch differences wasn't consistant enough for my liking.
My view only, I won't be buying another .17HMR.