 When fired from a full-length rifle barrel, most .22 Short loadings are as quiet as if not quieter than, the average air rifle.The Aguila SubSonic Sniper round uses a .22 Short case with a bullet (twice the weight of the .22 short bullet and half again as heavy as a .22 Long Rifle bullet) giving an overall length of a .22 Long Rifle round, making categorizing the SSS problematic