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Oh boy, lots of strange speculation in this thread...
Anything over 140dB will cause hearing damage, according to OSHA. That is pretty much every modern firearm without a suppressor. Those arguing that a 12ga SBS is quieter than a .223 AR-15...what have you been smoking?
9x19 out of an 8in barrel is respectable, but the terminal ballistics are definitely not as good as a .223. The wound channels and ft-lbs of delivered energy are usually much greater with the rifle round. Using 00buck or slugs at close range, the 12ga reigns supreme for wound channel and energy, in this comparison (at the cost of recoil, limited capacity, and being loud).
Using a suppressor and/or ear pro is a better answer than caliber changes, imo. That said, you can do both.
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