What is the difference between the (SMOA) Shooters Minute of Angle and (TMOA) True Minute of Angle?
SMOA subtends (covers) exactly 1 inch at exactly 100 yards. TMOA subtends (covers) exactly 1 inch @ 95.5yards or 1.047 inches @ 100 yards. There is an approximate 4.6% difference. An accuracy problem will occur if the scope you are using has the elevation and windage adjustment calibrated in TMOA and you are using a computer printout or range cards calibrated in SMOA. At ranges less than 400 yards you probably wouldn t notice the difference in accuracy; however, at 1000 yards you would miss the target. Note: For the rifleman using a Mil Dot scope, it is absolutely essential that you know if elevation and windage adjustments are calibrated in SMOA or TMOA.
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