The bullet is squeezed through the barrel, this helps keep the velocity up by avoiding gasses venting ahead of the bullet, it also helps to create the right rotation by squeezing the bullet into the grooves.
This is very, very basic ballistics knowledge. I would suggest reading up on gun ballistics if you are unable to grasp this simple process.
Most P08 pistols have the actual land to land diameter struck on the bottom of the barrel, generally around 8.81 mm.
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