If you were to put a can on the end of a 300 whisper and shoot a supersonic round it will sound very close to a 22LR which I would consider loud but hearing safe.
Shooting Heavy Subonic rounds (200+ grain bullets at less than 1000fps) will be similiar to a 45acp. I would think anything inside a 100 yards on Goat / Hog sized game should work. Out 200... I dunno
Damn sounds like fun though, I wanna shoot some hogs with my 300...