I've been using RWS sub-sonic hp for years , quiet ,accurate, and effective.
And they are much louder than the CCI Quiet. CCI quiet out of my 18.5 inch barrel Ruger sounds like a pellet rifle. The RWS subsonics sound like a .22lr- (much louder).
I won't be trying any CCI for that price...
I am paying well under $4/50 locally for the Aquila Super Colibris...
I get CCI Quiet at my local gunshow for 35 dollars a brick.
Super Colibri are very much inaccurate at ranges beyond 15 yards in my experience. I've chronographed them an have gotten extreme variations in velocities. The Colibri's short bullet also doesn't properly engage with the rifling compared to the Quiet's full length 40 grain RN. CCI Quiet are very much in a different realm compared to to the Colibri ammo.
In my opinion the Quiets are a specialty round made more for bolt action rifles with a long barrel. If ya shoot it out of any barrel under 18.5 inches, it will be somewhat louder than intended.
If ya shoot it out of a 21 + inch barrel, its gonna be very quiet.
I shoot them out of my 10/22 carbine 18.5 inch and it carries the noise levels of a high-power pellet rifle,..but it's low enough that hearing protection isn't required.
Still,.. if ur expecting what CCI advertised, than 21 + inch barrel length is ideal. They won't cycle semi autos however...
I've killed a few squirrels and a Jack rabbit up north. The squirrels were no further than 25-30 yards, but one shot to the head is all it takes, and they drop like a stone. The rabbit took a follow up shot.
Anything at or under 40 yards is what I would recommend for rabbit size game. If attainable,- head shots are recommended. It hits hard with-in this distance. And if ya have a long barreled bolt action, your in for a nice session with out disturbing others
The impact sound is often louder than the shot!
considering accuracy I've accomplished under an inch at 30 yards. At 50, the groups are approaching more on the side of 2 inches,..- thats atleast with my semi auto carbine. I've read reviews that state much better accuracy levels for bolt actions. Still how ever the power levels and accuracy potential make for a day and night difference compared to the Super Colibri ammo! Though, ...after 60 rounds ya can expect to get high levels of fouling from CCI Quiets.