I've never had a problem with any ammo in my K-22s, except with Remington Thunderbolts, which are just terrible, the worst .22 out there IMHO. I had extreme leading, even a partial barrel blockage, with them in my pre-18. On account of them, I avoid all Remington .22.
When in doubt, I turn to my favorites, CCI Mini Mags or Fiocchi HV. Both are super clean and consistent. I hunt them down and grab them whenever I can find them for $0.10/rd or less, so I've got a nice stockpile.
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