I have found a huge difference between shooting reduced power rounds from a rifle and from a pistol. From a rifle the CCI quiets are pretty quiet. But from a pistol, the only rounds that I have found to be quiet are the Aguila Colibri rounds. And the Colibri rounds really are very weak, something like 20 grains at 400 feet per second, which is 7 foot pounds of energy. For comparison, the CCI quiets are the strongest of the reduced power loads; they are 40 grains at 710 fps for 45 foot pounds of energy.