Reading the Wind

The groundhog is broadside at 220 yards, sitting up outside its burrow. You know the range. You know the holdover. You squeeze a perfect trigger — and the bullet kicks up dust four inches to the right of the animal. You missed reading a 10 mph crosswind. At that distance and with those bullets, 10 mph costs you nearly the full width of a groundhog’s body.

Quick recall

Quick recall — a .22-250 drops about how many inches at 300 yards when zeroed at 200 yards?

Quick recall — a .22-250 drops about how many inches at 300 yards when zeroed at 200 yards?

About 2 inches Roughly 6–9 inches About 20 inches

Check answer

Why varmint bullets and wind are a difficult combination

Light, high-velocity bullets have relatively low sectional density — they bleed velocity quickly and spend more time in the air than a heavier projectile moving at the same initial speed. More time in the air means more time for the wind to push them sideways.

Wind drift comparison in a 10 mph full crosswind:

Distance	.22-250 (55 gr)	.22 LR (40 gr)
100 yds	~0.6 in	~5.4 in
200 yds	~3.4 in	~18.9 in
300 yds	~10.7 in	~39 in

The .22-250 is dramatically better, but even it drifts nearly 4 inches at 200 yards in a steady 10 mph wind — enough to miss a groundhog cleanly.

The why Why does the .22 LR drift so much more?

The .22 LR starts at roughly 1,100–1,640 fps and loses velocity rapidly. By 200 yards a standard-velocity load has slowed to around 800 fps — barely supersonic. It is spending far more time in flight than the .22-250, which is still traveling at 2,800+ fps at 200 yards. More time in the air equals more accumulated wind drift. A 10 mph wind pushes a slow bullet as though it has a full extra second or more to act on it.

Reading wind: your three sources

No single indicator tells the full story. Use at least two sources and think about what is happening from the muzzle to the target — the wind can be different at 50 yards than at 200 yards.

Source 1 — Vegetation near the target

Grass and tall weeds between you and the groundhog show what the wind is doing at that end of the shot, which matters most since the bullet is slowest there. Use the Beaufort scale as a mental guide:

• Calm, grass still: 0–2 mph — essentially no drift
• Leaves rustle, grass tips twitch: 3–5 mph — slight holdoff needed
• Grass steadily bending, small twigs moving: 8–12 mph — meaningful drift
• Larger branches moving, difficult to hold a hat on: 13–18 mph — consider waiting for a lull

Source 2 — Mirage through the scope

On a warm, sunny day, heat shimmer (mirage) rises from the ground between you and the target. Look through the spotting scope or rifle scope focused partway between you and the target. The direction and angle of the mirage tells you both speed and direction:

• Mirage boiling straight up: nearly calm — very little wind
• Mirage tilted at ~45°: roughly 4–5 mph
• Mirage tilted at ~70° or flattened: 6–10 mph
• Mirage completely washed out: wind exceeds ~12 mph

Source 3 — Your puffer bottle or dust

A squeeze of talcum powder or a puff from a commercial puffer bottle shows the wind at your position. This tells you the muzzle-end wind, which is the starting point of the bullet’s travel.

Deep dive How to re-focus the scope for mirage reading

Your scope is normally focused at the target. To read mirage, turn the focus (parallax) ring forward — toward the shooter side of the range between you and the target. You want the shimmer midway down the bullet path to come into focus. Critically: focusing incorrectly can reverse the apparent direction the mirage moves. If you cannot read consistent mirage, default to vegetation and puffer-bottle sources.

The clock system: wind direction and value

Wind blowing directly across from 3 o’clock or 9 o’clock is full value — it has maximum drift effect. Wind from 12 o’clock (headwind) or 6 o’clock (tailwind) has almost zero drift effect. In between:

• 1, 2, 4, 5 o’clock: half value (~50% of full drift)
• 3 or 9 o’clock: full value (maximum drift)
• 12 or 6 o’clock: no value (no drift)

If you estimate 10 mph from about 2 o’clock, apply half-value: treat it as a 5 mph crosswind for your holdoff calculation.

Explore

Tap each wind-indicator marker to see what it tells you about wind speed and how to respond.

Mirage shimmer Grass near the muzzle Grass near the target Burrow mound

• Mirage shimmer Mirage tilted at roughly 45° indicates ~4–5 mph wind. Tilted flat or 'whippy' means 10 mph+. Boiling straight up means calm. Focus the scope short of the target to read it.
• Grass near the muzzle Grass tips barely twitching = 3–5 mph. Steadily bending = 8–12 mph. Lying almost flat = 15+ mph. This shows you the muzzle-end wind.
• Grass near the target This is the most important indicator — it shows what the wind is doing where the bullet is slowest and most susceptible to drift. Match it against your near-side reading for a consistent picture.
• Burrow mound Your target. After reading wind indicators, estimate the clock position of the wind relative to your shot line and apply the correct value (full at 3/9 o'clock, half at 1/2/4/5 o'clock).

Read the wind and make the call

Decision

220-yard shot. You look through the scope and see mirage tilted at about 45°, and grass at the far end is steadily bending to the right. Your clock estimate is roughly 3 o'clock — a full crosswind. What do you do?

Hold dead center — you've hit at 200 yards before with no holdoff Wait for the wind to drop to a lull, then take the shot Hold about 4 inches into the wind (left of the animal) and shoot now

Make the call on wind value

Knowledge check

The wind is blowing from your 2 o'clock position at about 10 mph. What wind value should you apply when calculating holdoff?

The wind is blowing from your 2 o'clock position at about 10 mph. What wind value should you apply when calculating holdoff?

Full value — treat it as a 10 mph crosswind Half value — treat it as roughly 5 mph effective crosswind No value — only 3 and 9 o'clock winds cause drift

Check answer

Knowledge check

You look at the grass 100 yards away and see the stems steadily bending and small twigs moving on nearby brush. What wind speed does this suggest, per the Beaufort scale?

You look at the grass 100 yards away and see the stems steadily bending and small twigs moving on nearby brush. What wind speed does this suggest, per the Beaufort scale?

About 3–5 mph — a very light breeze About 8–12 mph — a moderate breeze About 18–25 mph — a fresh to strong breeze

Check answer

Take it to the woods

Wind-reading practice at the range and in the field

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Reset

• Before your next range session, identify at least two wind indicators visible from the bench: flags, grass, trees.
• For each shot, call the wind clock position and estimated speed before you fire. Record it.
• After shooting a group, compare actual horizontal impact shift to your predicted holdoff — calibrate your eye.
• On a warm sunny day, practice focusing your scope short of the target to read mirage direction and speed.
• Practice the discipline of timing shots to lulls — wait for grass to settle before the trigger breaks. This is the highest-percentage technique in variable Piedmont field winds.

Sources

• Wind drift figures for .22-250 and .22 LR at 100/200/300 yards: https://backfire.tv/wind-deflection/
• How to read mirage for wind speed through a rifle scope: https://www.americanhunter.org/articles/2016/8/17/how-to-read-mirage-to-estimate-wind-speed/
• Beaufort wind scale and field vegetation descriptions: https://www.almanac.com/how-measure-wind-speed-beaufort-wind-force-scale
• Clock system and wind value for rifle shooting: https://www.ssusa.org/content/a-guide-to-high-power-rifle-wind-reading/
• Mastering wind reading for precision shooting: https://savagearms.com/blog/post/mastering-the-art-of-wind-reading-for-long-range-precision
• Wind and mirage precision shooting guide (SCFGA): https://scarfg.org/wp-content/uploads/2024/07/SCFGA-WIND-MIRAGE-READING.pdf