I have been shooting for a number of years, and in the past I shot some benchrest matches. IMO the worst is not short range benchrest, but when at a range where muzzle brakes are common. I commonly wear thin muffs that probably are only good for 21db in combination with 33db foam plugs. As Wilbur said it is the shots that happen when your muffs are off that are the problem when shooting at a range or match.
Some years back, I did some research relating to tinnitus (ringing in the ears) and came up with something that I think might be of use. It seems that the military did some research, using new recruits in boot camp as their test subjects, and without getting into a lengthy explanation, the group that took 100mg per day of magnesium had fewer problems related to firearms noise. This needs to be done on an ongoing basis, and not just on those days when shooting is done. The good news is that this level of supplementation has other benefits as well, so there is no reason not to take it all the time.
Years later I did some more research and found a study that showed that a percentage of tinnitus sufferers got significant relief by taking about a gram of taurine a day. My wife worked for 40 years in a factory, and when I mentioned this to her, she told me that she is bothered by tinnitus and said she would like to try it. I believe that it has helped give her some relief. About that time, I posted a link to the article on this site, and although I got a lot of skeptical to negative posts a friend who has had the problem for some time, read the article, and decided to give it a try. Later he told me, and reported here that it gave him about 75% relief from his symptoms, which of course I was pleased to hear.
One parting piece of advice, electronic muffs only offer the protection that they do when turned off, and you need to find out what that number is. One thing that you can do to increase their protection is to wear foam plugs under them, which will allow you to hear better when they are turned on, and give the same protection as non amplified muffs in combination with plugs.