Hi James,
My .22 Disco (before I returned it) was to loud for me to do routine shooting in my back yard. Not as loud as a .22 rimfire but still to loud for backyard shooting,,, at least for me. I guess the level of sound would also be effected by the terrain and the layout of your property/house etc. I say this because when I shot the rifle in the wide open areas of the duck farm I shoot at the sound really didn't seem to be loud to me at all,,, but when I shot it in my backyard the sound seemed much louder with a discernible "crack". I'm assuming this was because of the fact that the sound waves were effected by the physical structures on my property (house, shed, etc). Anyway,,, hope this helps ya out......
Jeff