Super quiet - especially with suppressor - Aguila Ammunition Standard Subsonic .22 Long Rifle 40 Grain Solid Point Brass Cased Ammunition

I've been using this for years to deal with rabbits around my house. It's quite enough on its own that it won't draw attention but with a suppressor it's James Bond quiet. You need to be close to the target and it will not cycle semi-auto which is fine for my uses (one shot one kill).