Disclaimer: I am not a medical practitioner. Ask yours about the following to find out if it is suitable for you.
Wearing hearing protection when at the rifle range, shooting clays, or at a driven bird shoot is a given. Wearing hearing protection when hunting is not so easy. One requires acute hearing right up until the instant that the trigger is pulled.
There are electronic products available which are advertised to enhance hearing and then cut off the report of the gun shot; but they are costly, and/or breakable. One such pair of muffs has four microphones and volume control, yet is reported, in customer reviews, to be of flimsy construction. Others are noted for hums, buzzes, and whines. Under field conditions, these products cannot always be relied upon to perform as desired.
If hunters have these problems, soldiers in combat have them to a much greater degree and with much more at stake. They have found the military issue equivalents not up to the job and prefer to do without. However, studies into combat hearing loss have come up with a solution to help prevent permanent damage to the ears which may be of use to hunters as well as soldiers.
The day before firearm season opens and for each day of hunting that you are likely to be exposed to gun fire at close quarters take: 5,000 IU of vitamin A, 1,500 mg of vitamin C, 400 IU of vitamin D, 800 IU of vitamin E, 15 mg of zinc, and 400 mg of magnesium. On the day that you are exposed to the noise, take an extra 5,000 IU of vitamin A, 400 IU of Vitamin D, and 500 mg of vitamin C. Continue on the higher dose for five days and then reduce to your usual non-hunting season vitamin intake. Some sources also recommend taking an Aspirin tablet in addition to the above.