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I am aware of Elmer Keith's contributions to the sport, but have always taken some of his feats with a grain of salt. The long range mule deer kill does make me wonder if the bullet would retain enough energy to shoot through both sides of the deer at that range, and this is from "researching" ballistics tables.
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Although sometimes fashionable among the "cool" kids, doubt Elmer at your own risk.
Less research, more shooting.
