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One way to measure the accuracy of a rifle is the size of the group in "minutes of angle", which works out at about 1 MOA = 1 inch at 100 yards, 2 inches at 200 yards, and so on.
Since it is commonly accepted that a rifle that shoots around a 3" group at 100 yards has adequate accuracy for deer hunting, folks got to calling a 3"-4" group "minute of deer", meaning that the rifle was accurate enough for deer hunting, although nothing to brag about.
Jim
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