I'm with the 22" crowd. I've got sissy ears.
Lately I've put a fair number of rounds through an 18.5" 6.5 CM Sig Cross as well as a 22" 6.5 CM Fieldcraft. I wear cheap ear plugs and muffs on top while shooting. The difference in the 18.5" and 22" is very noticeable to me.
I shoot 22", 21", and an 18" .223AI's. I can't tell a difference between 22 and 21.....18" is noticeable. Same for me on the 16" AR's.
I shoot a 21" .358 along side a 22" .308. Neither are bad but the .358 actually seems a tad bit milder on the noise. Expansion ratio, etc....
Kinda think anything under 20" should be suppressed for me. I really am a candy-azz regarding my ears.
