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If there were no atmosphere then the bullet would come down with the same speed it left the barrel. In other words it's like being shot from above.
If you add atmosphere then that means drag from the air and wind. That would cut the speed of the bullet as it went up. It's probably not a huge factor since a bullet is designed to exhibit as little drag as possible.
While it's not as bad when there's atmosphere it's still bad news if you're hit.
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"I do believe that, where there is only a choice between cowardice and violence, I would advise violence. Thus when my eldest son asked me what he should have done, had he been present when I was almost fatally assaulted in 1908, whether he should have run away and seen me killed or whether he should have used his physical force which he could and wanted to use, and defended me, I told him that it was his duty to defend me even by using violence." - Mahatma Ghandi
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