I've been using Peltor Electronic Earmuffs for over 30 years. They amplify sound and cut off at a loud noise like a gun shot. There may be something better, but these work ok and are only $65. I have worn out 3 of them over the years and need to pick up a new one. I wear them all the time when hunting with a handgun or my loud ML. I don't want to take any chance of firing either of those without protection.

When hunting with my rifle, I keep them in my vest and pull them out only if convenient. One shot with a .308 doesn't make my ears ring, but I will put them on before shooting if I have plenty of time.

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