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From what I can remember from my high school physics lessons (which I did not pay all that much attention to) you are correct about a bullet shot vertically into the air falling at terminal velocity.

Well you just got told Maca.

Dundee might hire his kids out for the night. They are both possum killers and they will clean up by taking the fur away as well. Seriously though do not use your .223 for shooting Possums up trees.