I just tried 2 types of ammo- host is 15-22 16" with Liberty Kodiak, with a good trigger. Remington subsonic 1050 fps according to factory, cycles the gun, "quieter" than HV, while CCI quiet 750 FPS according to factory, is much quieter than the rem subs, but, it will eject but not feed the next round. I have not seen the CCI suppressor loads, nor tried them, they are 250 fps faster than CCI quiet, they may cycle the 15-22 but will be louder than the CCI quiet, and prob less volume then the rem subs. After saying all that I paid the less for the quiet vs rem subs, both will kill small pests, just depends if you need to shoot more than "once". Be Safe.