The 3" rule sort of goes like this...from memory.
Sight in 3" high at 100, and you can aim dead on out to 300 and be within a 3" kill zone, and hold 12" high at 400 for a killing shot.
So, out to 400 yards you can have a killing shoulder shot without holding any light under the cross hairs. Just animal.
Remember that I quoted in my example a 4x non clicking scope. Strange, eh.
I recall that you would be dead on at 25 yards and an inch or so high at 50 yards.
Its time honored and proven. But maybe to some, just old fashioned shit.
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