Peltors do NOT have sufficient attenuation on their own to offer full protection against an un-moderated large cal CF. SPL for say an un-moderated .308 with 20 inch barrel is between 150 and 160dB as measured at 1m (ie close to the ear). Peltors, like MOST electronic/passive defenders only attenuate to 25-ish dB if not a little more. Some better ones manage 30dB. Hearing damage occurs above 110dB if regular exposure occurs, and 120+dB instantaneous, therefore you do need to wear in-ears plus Peltors for full protection against an un-moderated rifle. I now use SportEar X-pro in-ears plus Peltors for range use to protect against the louts (

) who insist on using muzzle breaks over moderators. I do wish that the industry would address this problem because its inexcusable at any price to tout hearing protection as suitable for shooting, when clearly, most simply are not....on their own. Part of the reason I lost hearing in one ear.