Re: Tried some new ammo today...
have you tried Aguila's 60gn round? It's a large bullet in a short case but fits .22lr chamber. They have them loaded subsonic, very quiet in rifles. (not so much in pistols).
CCI subsonic is the quietest LR I've tried but I still keep some CB's for when I need to be silent.
"Loud noises don't end gunfights.... well placed shots do."