I've had great results in my 22 pistols using Eley subsonic HP's. Accuracy is the best I've tried and they kill well. I recently purchased a few boxes of the Eley HV HP's but have not tried them yet. I have similar rimfire pistols you listed:
S&W 17 K-22 w/ 8 3/8"
Ruger MKII 5.5" - Clark custom conversion