It may also depend on your suppressor. I have a large suppressor and it quiets my 5.56 gasser down a lot, but throws a lot of gas out. Going to a non-gasser makes a huge difference though.I sort of inherited a .223 AR pistol and that thing is LOUD even with a suppressor. This thread gave me the idea to flip the gas block around to see if the lack of "port pop" is enough to make it somewhat close to hearing safe. I'll just manually cycle it for a few shots to test the theory.
If I like how that works I'll probably get some fiberglass parts, make it a manual side charger and turn it into a really light and compact "backpacking" gun. Basically light enough that I'd carry it when I wasn't really hunting but capable enough I'd have a decent chance to kill something if I saw a bear and started hunting. With my barrel length I think I could get 200+ yards. But if the little stinker stays that loud I might switch to a 300 Blk or something a bit longer.