A suppressed 22 pistol is noticeably louder than a suppressed 22 rifle, but it’s still a lot quieter than shooting either one without a suppressor.
This was my experience until I got my last rimfire suppressor, a Dead Air Mask. Virtually no first-round pop in a pistol, and much quieter than either of my earlier suppressors (In a pistol). Note that I write "in a pistol" since pretty much any rimfire suppressor will quiet a rifle down to 'extremely quiet'.
As someone noted above 'Standard Velocity' 22 LR ammo is subsonic.
The supersonic crack, whether from a suppressed centerfire or a suppressed rimfire will vary depending on topography and trees. Basically, if there is nothing to bounce the sound back to you (a large open meadow for instance) then the supersonic crack will be much quieter (to your ears).
Shooting in the back yard and don't want the neighbors or the family to hear you==> shoot subsonic or standard velocity rimfire.
Jerry
