Try the Howard Leights over the Peltor 6S. I've got both and the Peltors, while slightly better, are much thicker and end up bumping my stock alot.

Amplified muffs are great for both protection, normal hearing, as well as actually using them to 'amplify' other ambient noises, in essence increasing your effective hearing to much longer ranges. Sometimes out in the desert shooting I'll hear a truck or motorcycle driving and look about thinking its close, only to realize it is way, WAY off. Great products. Good luck.