So far as hearing damage goes, even rimfires cause damage. The damage accumulates, little by little, eventually becoming a problem. From your ears standpoint, a 30-30 is not quiet enough to be harmless.
Imagine your grave on a windy winter night. You've been dead for 70 years. It's been 50 since a visitor last paused at your tombstone..... Now explain why you're in a pissy mood today.
