“Using a subsonic load in a long barreled gun can produce relatively quiet gunshots without a silencer or suppressor.”
Yes. Or low powered loads in a short barrel pistol. Favorite “Mob Hit Man” load. .22 short in a 2” revolver. I’m not sure why this article was necessary? More gunpowder, more noise. Short version.
A .22 short in a 2" barreled revolver, to me, is much louder than a .22 long rifle standard velocity out of a 24" barreled rifle.