That is showing degrees of yaw or where the nose of the bullet is pointing, not the flight path of the bullet. The diagram on the right is showing where the bullet actually went. It started diverging as soon as it left the muzzle and continued to do so. Once the deflection starts, it won’t get any better. There is nothing acting on the bullet to make it “go that way to hit the target”.
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The video is the answer the first part of the question. And you correctly answered the second part. Bryan did a lot of experiments using shoot through targets to prove that group size doesn't shrink with distance.
