Quote Originally Posted by Locosmith
I can't buy it either. A db meter is the sound level, that would be when the bullet passes the crown. The vibration of the barrel or harmonics would be different but I don't know or can prove that would equal more sound???? ::)
First, sound travels through all mediums, not just air. That has a lot to do with the "vibration" or "harmonics" you are referring to. Second, when a piece of steel vibrates it is definitely capable of transmitting those vibrations through collisions with air molecules to radiate sound. Think of a tuning fork. Because the amplitude of the vibration of a sporter barrel will be much greater than the amplitude of vibration of a stiffer, heavy contoured barrel, it makes sense that the amplitude of the vibration transmitted to the surrounding air will be much greater also. In other words, the sound radiating from the sporter barrel will be louder.

Just because a door is closed doesn't mean you can't hear what people are saying in the other room. If the walls are thin enough, you can hear every word.