Might just be my ignorance, but I shoot quite a few 22LR's without protection. Only in a rifle, though. The same rounds that are fairly quiet in a rifle are pretty noisy in a handgun. And I always use plugs when practicing with larger stuff like my 222 Rem or shotguns. In the field hunting, though, we all shoot even the big stuff un-muffled and, especially bird hunting, may fire numerous times in one morning.
My personal feeling would be that especially with sub-sonic or CB ammo in a rifle, protection would not be required for the occasional varmint shot. I have used both in rifles with good success. Keep the Aguila Colibri rounds out of the rifle, though. They are VERY quite (hammer snap is a lot louder than the actual detonation) but can easily lodge in the barrel.

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