I would get ear plugs. It doesn't matter if they are the cheaper soft sponge type or the molded solid plugs. Both offer a NRR rating of about 30-32 which is higher than any ear muffs that offer NRR of 19-23 for lightweight models to 24-26 for heavier models.
(NRR= Noise Reduction Rating). The maximum NNR rating that can be achieved is about 36 and that is using both high quality plugs and muffs at the same time.
I find that ear plugs do not restrict head movement, doesn't interfere with my hat and are more comfortable to wear esp on warm days.
I use a pair of custom molded silicon ear plugs during warmer days and the disposable soft type on cold days. Solid ear plugs conducts the cold right to my brain and causes brain freeze. The sponge type does not.
I use both plugs and muffs if I wear my helmet. Usually you can go to an audiologist and have a custom mold made of your ear for about $20. You can take the mold and then send away to IE ear inc to get solid plugs or just have the audiologist order them. Molds and plugs should cost about $60 total. Get a visible color like yellow or red so they will be easy to find if you drop one.
The sonic 2 ear plugs (the ones with a baffling system which only blocks out loud sounds) only have a NRR rating of 7 which is very low. There are digital ear plugs that allow one to hear better. Of course using both is better than either alone
Remember, not only gunshots may injure your hearing but the calling also. The goal is to try to achieve a dB level less than 85. Here are some random levels.
0 dB – Lowest audible sound
50 dB – Quiet empty barn, babbling trout stream, gentle breeze
60 dB – Normal conversation
70 dB – Chicken coop, farrowing area
85 dB – Tractor or combine idling, barn cleaner, conveyor, elevator: You can begin to lose your hearing at this dB if you're exposed to it for eight (8) hours or more per day.
90 dB – Blower compressor, pneumatic wrench, chopping silage (no cab), full-throttle mower,: If you are exposed to noises at this level for four (4) hours or more per day, hearing loss can occur.
100 dB – Tractor at 80% load, squealing sows, power tools, hand-held metal grinder: One hour of exposure per day is the limit at this decibel level.
110 dB – Average Walkman set above the halfway mark, full-throttle combine, 10-HP vane-axial barn fan: Anything over 15 minutes exposure per day can cause damage.
120 dB – Thunderclap (near), sandblasting, bad muffler, old chain saw: The danger is immediate.
140 dB – Gunshot, engine back-fire, dynamite blast, jet engine. Any length of exposure time is dangerous and may actually cause ear pain.
As noise gets louder, damage can occur sooner. There is no "cure" for hearing loss. This chart is only a guideline. Anything over 85 dB can be damaging to your hearing.
I am a very part-time arborist and full time physician