When bullets fall to the left or right of a perfect hold, the simplest way of explaining it is that the wind blew it. What is even more difficult to face is the fact that wind driven misses tend to accumulate numerous minor issues some of aerodynamic nature, others of observation, and others simply of human nature.
The greatest discovery of most shooters is that the wind does not blow back against the side of a bullet as it blows against employee dust. Rather, a wind causes the bullet to alter its course of motion prematurely and distance transforms that slight push into a great miss.
1. Wind deflection, not “wind blow”
A crosswind does not present a bullet to one side as it presents an object in loose condition. This is the main process which is deflection that provides the bullet with a new set of vectors of movement, and new heading leads to the target. That is why a little mistake on the earlier stage of the flight can become the huge miss on the downrange even when the conditions appear to be more favorable at the target. It also describes how the shooters are able to see the effects of the shots to walk on the paper when the wind is not steady at the firing point.
2. The wind at the muzzle matters more than shooters think
The wind near the shooter possesses disproportionate power as it causes the tip of the bullet to blow off before it can fly away like a weathervane, and cause the whole path to lie on a new course. Practically in the field, a last second rush at the firing point would be better than a last second rush close to the target since the bullet has much more distance in which to develop the error. A single point of reference that is worth remembering: the wind at the target will have very little time to act on the bullet, whereas the wind around the shooter can increase its power with range.
3. Time of flight is the real drift amplifier
The corrections of the wind are proportional to the duration of exposure of the bullet to the lateral constituent of the air, and not to the distance it travels. The best example is the comparison of the drop test at 700 yards: a fired bullet may exhibit startling down wind movement and a dropped bullet will shift hardly at all over one second. The lesson about group size is simple: anything that makes time of flight more, slower at range, inefficient of form, or whose trajectory loses speed fast, will cause wind errors to be larger and more difficult to notice shot to shot.
4. Bullet shape (BC) gets blamed on weight, and the wind wins
Bullets that are heavier are usually presumed to be bucking the wind, as that is the feeling that they give. As a matter of fact, it is all about shape and drag: the ballistic coefficient is higher, the bullet is less likely to decrease its speed, takes less time to reach the target, and can deflect less on a certain wind. That misconception gives rise to the wrong loads with the shooter anticipating that mass will resolve a wind problem which is actually more of a drag and time-of-flight problem. A smooth profile may cut drift far more than a blunt one at the same muzzle velocity, which produces on paper populations that spread horizontally as the length of the run is increased.
5. “Full value” and “no value” get misread in the moment
To work laterally, wind must pass through the path of the bullet. Direct head or tail wind results in virtually no left-right drift whereas the cross wind with 90 degrees gives optimal drift. This is termed by long-range shooters as wind “value” and field shooters tend to estimate it by the clock system. In case of a false guess at value taking an angled wind as full value, or full value wind as half value the groups open quickly, since the correction is also incorrect in the same direction on all the shots, till the shooter notices the pattern.
6. The downrange wind is not one wind
Terrain gives rise to a variety of wind vectors between muzzle and target: eddies in draws, accelerations due to saddles, thermals due to disproportionate heating, direction changes that can not be seen at the firing point. The complexity of it renders a single reading on the shooter inadequate on most ranges.
The nearest clues are the best availed sensors which are: grass, leaves, dust and above all, mirage in suitable conditions. Even old hands come to hold, on average, only to be seen afterwards, to which is why the group may appear random when the wind is in reality organized organized differently in each part of the path of the bullet but organized differently as well in each part of the path of the bullet.
7. Mirage and indicators are there, but focus and method break down
Mirage is able to give direction and a good wind speed in the line of sight of the shooter although it only helps when properly noticed. It can be that, frequently, through optics, the shifting of the focus in order to study various portions of the range rather than the target. One method is to put the mid-field in focus with parallax and re-focus with parallax to ensure the target is closer before focusing on the target and creating multiple wind snapshots rather than a single one. Different use of this technique creates different holds so groups broaden even where the shooter thinks the wind call is being checked.
Thick masses in the wind seldom have a single ill-informed conjecture. They are descendants of one or another of the mistakes: failure to understand deflection, excessively weighting one wind reading, incorrect assessment of the value of the wind, and failure to recognize that the terrain splits a single flow of wind into a number of different flows. By a systematic treatment of those seven causes, going back to the muzzle, and then tracing the eye down the range, wind ceases to be a mysterious influence, to be a quantifiable producer of horizontal dispersion.
