Both Colibri & Super Colibri are quieter than the CB longs out of a rifle. The Super being just a tad louder & quicker than the Colibri. Both are effective on small game out to fifty feet or so. However, not all rifles are able to fire the Colibri rounds without lodging in the bore so be careful. I've also had a fair amount of misfires with them.waltonshooter said:I am looking for the absolute quietest ammo, without buying a silencer, how do the super colibri, and colibri compare to the cb's?