[zahc]

I have a question.

Say you have a crosswind situation and you correct for windage. Do you hit higher when the wind is coming from the left and lower when the wind id coming from the right (depending on the rifling twist direction), because of the aerodynamic effect of the crosswind+bullet? Has anyone ever noticed this at all? Does it exist?

[zahc]

Does anyone understand what I'm talking about?

[patent]

I believe I understand your question, and it would seem to relate to the direction of the spin on the bullet, and how that spin might interact differently with different types of crosswinds. A wind coming from one side will impact the bullet side that is rotating upward, while the wind coming from the other side would impact the bullet while (that side) is rotating downward.

I'm not an expert, but did a quick web search and found this:

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Conclusion:

I think that we can see from Mr. Nennstiel's answers to this ballistic question, that unless all groups being shot are at or under 0.1 MOA, (one tenth of an inch) then the vertical component in the group caused by changing wind velocity or direction is immaterial, and certainly no where near the 0.25" or even greater vertical deflection that has been claimed as the suspected cause by various competitors.

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The link is here for the full exchange: http://rifle-accuracy.com/vertruth.htm

I can't vouch for the information in any way.

patent

[wanderinwalker]

It may indeed exist. But in my experience (only out to 300 yards) when shooting from position, if there is any elevation change, you can't see it in the "real world." You will see more dispersion from your ammunition and your position than from any effect of aerodynamics.

Honestly, put down the calculator and give it a go. Experience and practice count for more than theory. ;)

[30Cal]

Nope. Wind won't drive elevation unless you've got a fluky updraft off a burm or something and even then it probably wouldn't be worth moving the sights for.

If you look carefully at the rear sight of an M1903 Springfield, you'll notice that at extreme range (like >1500yds), the sight will start to add right windage to correct for gyroscopic precession. A force (gravity) applied to a rotating object (bullet) will be offset by 90 degrees. So gravity actually causes the bullet to go left over really really long distances.

Ty

[zahc]

sweet:D