Re: Compressed air trapped in the hollow cavity of SMK ??
Probably what you are seeing is the damage caused by "temporary cavitation". There are 2 things a bullet causes as it passes through flesh, 1: a wound chanel, and 2: cavitation. What that basically is, is like a shock wave in the flesh as the bullet passes through. It can actually tear meat and tissue of of bones.
When a bullet causes a 1/2" wound channel, depending on the density of the aniaml and the energy of the bullet, it will cause a 6-16" wound area cause by this cavitation.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.