I use the Accu-Life Shooter's Ear Plugs.
http://www.earplugstore.com/health-e...ear-plugs.html
They plug into the ear & allow pretty much normal hearing. When there is a shot a mechanical valve closes instantly reducing the firing signature to a safe level. Don't be put off by the "18" NRR rating, its a function of how hearing protection is tested, not the plugs not working well. The test uses continuous noise, not a pulse so the results are skewed drastically as a steady noise doesn't close the valve.
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Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”