MOA Adjustment

Clem Bronkoski said:

So let's see if I understand this. If I have a RH twist like above and the wind is blowing right to left I would dial less MOA adjustment and that adjustment is determined by the actual force AND direction.

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Yes, that's right. Said another way, if the wind was blowing from right to left, you made no adjustment beyond your no-wind expectation, and you aimed at the bullseye, your bullet would land where the circled #3 is in the above chart - both left (due to wind) and up (due to the vector wind effect and your right-hand barrel twist). To correct it, you could either hold for point #9 in the chart (low, right) or dial for both the windage and elevation effects.

You're getting a sense of why long range shots with wind are difficult.

Barbourcreek said:

You can see in Eagle Ballistics app look at the elevation with the U next to it as the wind changes the aerodynamic jump changes your elevation dial Ups

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Very interesting. Now is this with a RH or LH twist? I stopped the video with a wind from the left at 5.31mph and elevation was up 14.9, then again with a 5.1 mph wind from the right and the elevation was up 13.9 this is at a range of 655 yds. Roughly about 6.8" POI difference which would mean a complete miss on a dead center hold on a deer at that distance if my calculations are correct.

Clem Bronkoski said:

Very interesting. Now is this with a RH or LH twist? I stopped the video with a wind from the left at 5.31mph and elevation was up 14.9, then again with a 5.1 mph wind from the right and the elevation was up 13.9 this is at a range of 655 yds. Roughly about 6.8" POI difference which would mean a complete miss on a dead center hold on a deer at that distance if my calculations are correct.

Click to expand...

Right twist