it maybe of interest to some although those ex service personell may already know. When a bullet passess through flesh the entry wound expands to about the size of a tennis ball with the shock wave of the entry, as the bullet continues the elasticity of the flesh returns to the normal size hole at the point of entry. As the bullet continues, it creates a vacuum behind it. The bullet then pushes everything in its way in front of it and forces it out of the exit wound as it cannot escape due to the velocity and mushrooming of the expanding bullet head which then errupts carrying bone fragments and flesh.
As the bullet leaves it causes a term called suck and blow, the vacuum drags everything into the bullet track this includes pins and any vegetation caught in the bullet path. Once the bullet exits the vaccum ceases and the air at he point of exit then rushes back in dragging with it dead flesh and anything else in the vacinity of the exit site.
The tracking bullet path will contaminate the flesh around its route due the shock wave.
I was trained in first aid when I was in the police tactical firearms team and went to many seminars including SBS first aid teams and Northern Ireland surgical teams who learned through operating on victims of shootings how bullets react when entering the body.
If anyone has the chance to see how ballistic clay reacts when a bullet enters, it is well worth seeing, it opens your eyes as to how the body reacts to the trauma of a bullet stike
I hope this is of interest
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