What is overlooked by many people is that the standard highest quality muffs attenuate the noise by about 30 dB.. This is subtracted from the above listed values. Ergo, a magnum fired near you will apply about 165 - 30 = 135 dBA to your ears which is extremely damaging. Wearing internal plugs with the muffs will give you another 6 - 10 dB of reduction (I always use both). If you are in an indoor range and somebody is shooting a magnum, your ears are being damaged. Incidentally, the muzzle wave has a "null" directly behind the muzzle which means the shooter is not getting hiy as hard as the guy on either side in the next lanes.