I have used custom molded in the ear plugs that have double industrial filters in them. Bought my first pair in 1990 or so while shooting trap. We have four pair of Pro Ears Gold muffs. They amplify, but cut off at a certain delible. At the range I frequently turn them up and wear a pair over my plugs and that works out good if some jerk is next to me with a SBR with a muzzle brake on it. I can very clearly hear conversation, but those muffles shooting noise almost to nothing.
Varmint shooting I just use my in the ear plugs most of the time. I have used the Pro Ears in tree stands while deer hunting. Not much good if the wind and rain are like when hunting is good though.
I'd be deaf as a post if Ron Tree, the Winchester Trap guy, hadn't given me a pair of muffs when I was a kid. He chewed me out pretty good. As it is, I have a $7K pair of hearing aids, but never use them. They amplify women and kids voice. There is good reason old men lose that range of hearing. Women and kids get on a man's nerves. Maybe I'll try them for big game hunting. The plugs work fine for upland bird hunting.