I have also concluded that all foam plugs are not the same. And some of the max DB plugs are IMO enough for 16-18in guns when shooting outdoors. This is for me being the shooter, when another shooter at a match has a muzzle brake I put my fingers on the plugs while the rifle is being shot. Obviously if you were at a row of benches this would be no good.
But they are not so comfortable, and after several hours shooting I am glad to get them out.
Conversely, the lower DB plugs are very nice for motorcycling and mowing, and better if you are doubling up.
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