As with any rimfire, you're just going to have to try a variety of ammo to find what your particular barrel likes. Aside from that, it's been my experience that 22 WMR ammo generally isn't very consistent so getting great groups with any type is a shot in the dark. Best I think I've ever got from a 22 WMR was 3/4", with most better groups falling in the 1" to 1-1/4" range. That's plenty accurate for any hunting needs which is all the WMR was ever intended to be.
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