I have a few boxes and use them one at a time in my Marlin Model 60. They won't cycle it, but it's no problem to manually cycle it, especially the way I use the rounds. I put out bird seed about 35 yards from my house. I occasionally get a rat and I'm able to pick them off from my upstairs window using CCI Quiet 22 LRs. They are actually quieter than my Diana RWS Model 34 air rifle.

[Linked Image from i.imgur.com]
https://vcdl.org/