I've been using the Howard Leight Impact Sports muffs. Midway has them for $60 and they can be had on sale occasionally for less than $50. They have dual mics so you get directionality, a stereo input plug if you want to jack in an MP3 or radio and are pretty thin with a NRR of 22.
I always - most always, anyway - wear plugs under muffs (even non-electronic). With these, I just turn up the volume until sounds are normal or louder (better than a hearing aid). They are nice as they don't cut all output upon a high impulse noise, they just don't amplify it beyond a comfortable level. You have no problem following a conversation or range commands even while firing is going on.
Nick
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