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As far as why someone might pick a .300 Mag over a .308 Win all boils down to human capabilities. Both can be equally accurate & equally lethal. But at longer ranges, the magnum has the advantage if the shooter is just using his "guesstimation" to figure the range. More speed means flatter trajectory which means the bullet will fall closer to the point of aim for a longer distance. If bullets traveled in a straight line like laser beams there wouldn't be much need for small caliber magnums.
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