If Cabela's or Bass Pro has a store in Charolette go there and try some on. Suggest you buy the highest NNR rating you can find. My muffs are 30dB which is very high. Your range might sell "ears" too.
Most brand name Muffs are adjustable for big melons....I have one. I have Caldwells and Walkers....I prefer the Caldwells. Peltons are pretty good too.