Semis are hard to judge. On ARs you have port pop, on the platforms list above you have gas escaping through ejection ports. Unless you can lock the action closed, that is the only thing that will help. That address those platforms, anytime you shoot supersonic ammo even a 22LR it is going to be loud. I can take my 308 bolt gun and shoot it 3-5 times without ears on and my ears are not ringing. That's with supersonic ammo, if I run subsonic ammo it is a different story.
The moral of the story is silencers are not as quiet as most people think. Yes they will 100% save your earing, you don't have the big blast to deal with either. At the range you should use ear pro, in the field for a few shots you will be in a much better shape without ears.