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The air rifle caliber determines the distance up to which it can shoot accurately, the power of your air rifle and other aspects. There are majorly 3 caliber variants i.e. .20, .22, .177 caliber. .177 air rifle is the most common caliber, hence a huge variety of manufacturers offer .177 caliber air rifles. Air rifle scope. How quiet a silenced 22lr is, depends on the silencer being used. Generally, you can expect to get 20-36 dBs of sound reduction with a silencer. This will usually bring you down below OSHA’s recommended safe relative sound pressure level of 140 dB.