Well, I guess its possible. Can't say I have ever heard it. Time of flight of a moderateslug is between .2 and .3 seconds to 150 yards. Speed of sound is around 1150fps depending on humidity and temp and pressure. So a 150yard is 450ft, so it would take .39seconds for the sound to reach you, so it would take ~0.7sec after pulling the trigger for you to hear anything. I just can't imagine hitting a deer or whatever would make enough noise to actually hear it 150 yards away.