I tried the cci quiets for beaver, but even at very close range they are not powerful enough.
I like em.
But I spent a bunch of time getting used to the trajectory, and they are definitely not a round for use when you do not need or want the quietness.
Anyone who figures there is some sort of magic answer to the problem of noise levels, has to understand that the solution comes with trade-offs, usually in the form of velocity and/or energy reductions.
This holds true in the bigger calibers and in the use of sound suppressors too. The guys in the US using suppressed guns in calibers like the Blackout series, typically use a very heavy bullet for the caliber, running at subsonic speeds, so as to carry the energy out to the target, and the price for that is a heavy arc of the trajectory to deal with. There is no free lunch!
CCI Quiets are simply a down-loaded long rifle case and bullet. They move very much slower than a standard or high velocity round, and as a result, they do not have the terminal performance that many seem to think that they should.
For all their hype, the Aquila SSS rounds are simply a longer heavier bullet mounted on a Short size case with a light load of powder. Most .22's that I have heard of, tend not to be able to shoot them well, as the twist rate is not fast enough to stabilize the longer bullet. And they are hardly good enough ammo to pay for a fast twist barrel for.
End of day, you have to deal with the terminal results and adjust your shot choices and placement, to the slower moving rounds, if you want them to be effective killers. They will not immobilize a beaver with a body shot, you need to hit brain/spine to do that. A very small target to hit reliably. Better to have the noise.