I am going to attach a photo of my third target from last Saturday and for 600 yards I would think that the vertical is acceptable but you can see that the wind, I hope, was moving the 103 gn bullet around quite a bit or either I am a very bad aim.
The date on the targets was correct so I assume the time is correct also. That being said target 1 was shot at 9:09 am and target 4 at 11:59. That is a 3 hour time difference in the information listed above and a pretty good increase in temperature.
Everyone mentions velocity at the muzzle. These numbers at the target are so different that you cannot relate the two. To me that is a little confusing. WWE