I have several friends who shoot muzzlebrakes and working together zeroing their rifles is really a pain. They obviously work because my 2 buddies shoot better, swear by them, and won't shoot without them on their guns!! I have to hunt with these guys but must protect my hearing.

I can't go around all the time with my fingers in my ears at the range.
What electronic ear plug protection is out there and how well does it work?? I understand that they allow normal frequencies thru but block high frequencies.

Has anyone used this type of ear plug in Africa?

Any suggestions??