Can anyone tell me how much a 10mph tail wind would affect a 6mm bullet traveling 3250fps out to 300yds vs a zero wind at the same distance? The bullet has a BC of lets say .530ish.
Range Report Head & tail wind question.
- Thread starter JGorski
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At a longer distance it does. And im sure it does to some extent at 300 just not enough to change the come ups
I believe the greater concern about head and tail winds is that they tend to fishtail, not effects on elevation. Slight variations in a head or tail wind make a significant difference. Slight variations in the direction of a side wind are less impactful. I ran some numbers the other day on a 10mph head vs tail wind, and it was something like 0.2 moa at 600yds.
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Thanks guys, found this a min ago.
A bullet's reaction to a wind depends very much on both the speed of the wind and the direction in which it blows. In the first place, a headwind or a tailwind causes a vertical deflection (a change in drop) of the bullet, while a crosswind causes a horizontal deflection. It also happens that a crosswind causes a much larger deflection than does a headwind or tailwind of the same speed. As an example, take the .308 Winchester cartridge loaded with the Sierra 190 grain HPBT MatchKing bullet at a muzzle velocity of 2500 fps. At a range of 600 yards, a 5 mph headwind would cause the bullet to strike the target 0.30 inch lower than it would with no wind. A 5 mph tailwind would cause the bullet to shoot high by the same amount. In either case, a well-aimed shot certainly would stay within the X-ring on the 600 yard target. But a 5 mph crosswind would deflect the bullet 14.35 inches to one side, with a devastating effect on the shooter's score if he hadn't made a windage correction.
A bullet's reaction to a wind depends very much on both the speed of the wind and the direction in which it blows. In the first place, a headwind or a tailwind causes a vertical deflection (a change in drop) of the bullet, while a crosswind causes a horizontal deflection. It also happens that a crosswind causes a much larger deflection than does a headwind or tailwind of the same speed. As an example, take the .308 Winchester cartridge loaded with the Sierra 190 grain HPBT MatchKing bullet at a muzzle velocity of 2500 fps. At a range of 600 yards, a 5 mph headwind would cause the bullet to strike the target 0.30 inch lower than it would with no wind. A 5 mph tailwind would cause the bullet to shoot high by the same amount. In either case, a well-aimed shot certainly would stay within the X-ring on the 600 yard target. But a 5 mph crosswind would deflect the bullet 14.35 inches to one side, with a devastating effect on the shooter's score if he hadn't made a windage correction.
You're more likely to see terrain effects from a head wind or tail wind that will move the shot more than the theoretical push or lift generated.
The biggest problem with a head/tail wind is that they are very, very rarely ever dead nuts 12/6 o'clock, and it can be difficult to recognize the shift from 12 o'clock to say, 12:30... which can be more than enough to generate a miss.
The biggest problem with a head/tail wind is that they are very, very rarely ever dead nuts 12/6 o'clock, and it can be difficult to recognize the shift from 12 o'clock to say, 12:30... which can be more than enough to generate a miss.
Head or tail winds cause a slight increase or decrease in drag, the effect is generally minimal at most reasonable ranges. Cross winds cause drift, also as a result of drag as the bullet aligns itself with the relative wind. If the range is long enough, there is a vertical component to cross winds as well. L-R cross winds will result in a higher POI and R-L will result in a lower POI, once again due to drag and the yaw of repose which puts a bullet slightly nose up and right (for normal right twist barrels).
Wind does NOT 'push' bullets. Wind deflection is a function of drag.
Wind does NOT 'push' bullets. Wind deflection is a function of drag.
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