When faced by multiple crosswinds, doctrinally you should time your shot so one wind is calm and the bullet passes through the other, which is the only one you compensate for.
Does it make any difference which of these winds is the one you shoot through? Absolutely, and our drawing shows why.
Assuming both winds are of equal velocity, the near wind has more time to push the bullet sideways and will cause it to be much farther off target than a far wind. Therefore, you should shoot when the near wind is calm and compensate for the far wind.
and, as already seen, that, would make it a full wind. Next, consulting with your spotter, determine the speed of that wind; we'll say that you agree it's 5 mph. Finally, you both expertly estimate your target is 600 yards away. You're using Federal .308 BTHP Match.
Looking at the table on the page 359, you find that the required compensation is 16.1 inches. The compensation on all the tables reflects a full value.
Since your scope has an adjustable windage knob, you dial in the equivalent of 16.1 inches at 600 yards; since 1 MOA equals 6 inches at that range, you rotate it 2.75 MOA into the wind. And because your scope has 1/4 MOA positive clicks, this means you turn it 11 clicks.
Having made the adjustment, you aim dead-on, let off a good shot, and score a perfect hit. If your scope lacked
a windage knob, you would have looked at the target, determined that 16.6 inches is the width of a fit man at the hip, and held this far into the wind, aimed, and engaged, again with perfect results.
But what about other than full-value cross-winds? Just factor in the value when determining the compensation. Let's try another example.
You and your spotter agree the wind is 15 mph, coming on at a 45-degree oblique, and the range is 800 yards. Again you're using a Federal .308 Match round. The table says full compensation would be 96.1 inches, but we will only use 3/4 of that because the wind is oblique at 45 degrees. Three-quarters of 96 inchcs, you compute in your head, is 72 inches.
So, if you have a windage knob you realize that 1 MOA equals 8 inches at 800 yards;
RANGE AND WIND Estimation 359
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