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Subsonic bullets are also subject to vertical drift, due to rotational friction against the wind. For instance, say a 10 mph wind at 9:00 will move a .22 LR about an inch right of center. The drop will be approximately 1/5 the horizontal. Conversely, wind from 3:00 will cause the bullet to rise about 1/5 the horizontal.
Wind from other various clock positions will create lesser combinations of drop or rise as well as deflection, but any wind angle from 12:00 to 6:00 will cause the bullet to rise somewhat and from 6:00 to 11:45 or so will cause a drop component. Winds close to 12:00 can cause either rise or drop, unpredictably, so rimfire benchresters try to hold the shot and wait for the wind to change.
Swirling winds on bermed ranges can be hell to rimfire bench folks; been there!
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