The Otto NoizeBarrier Micro
I have used the Otto NoizeBarriers while competition shooting at the range and for pheasant hunting for a few years now. I just bought these as a replacement for the set I lost.
At the range they do a great job of dampening the noise while I'm shooting or ROing shooters with even the loudest of open guns. At the same time, the amplification allows you to hear edge hits on steel at 35 yards. I am also able to talk and listen to fellow shooters without difficulty.
The Ottos are also great for bird hunting. Easy to hear the roosters cackling before you see them and they are comfortable so it is no problem wearing them all day. I would strongly recommend the soft Comply tips. The convenience of the charging/storage box is awesome. The box holds a charge for six months. They are so much better than constantly replacing the little hearing aid batteries in other systems that I have had in the past.
They are not cheap, but if you shoot a lot, they are worth it.