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Long Range Shooting & the Coriolis Effect
Am Shooting Journal ^ | 12/2/2019 | J Winters

Posted on 12/02/2019 5:17:30 AM PST by w1n1

If you’re into long range shooting, its important to understand how the "Coriolis effect" affects your shot at 1000 yards or greater.

The Coriolis effect is the rotation of the earth and the movement of a target downrange from the shooter. This is another element that a long distance shooter has to consider for along with wind, rain, snow, distance, elevation and a many other factors. Accounting for all these factors signifies the skill sets needed for precision long range shooting. Here's the laymen's term for "coriolis effect".
"if you're shooting West, your target’s gonna rotate up and towards us, which is gonna cause the bullets to hit lower."
"if you're facing east, the target’s going to be dropping and slightly moving away, which is gonna cause the hits to be higher.
"
Read the rest of long range shooting and coriolis effect.


TOPICS: Hobbies; Outdoors
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1 posted on 12/02/2019 5:17:30 AM PST by w1n1
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To: w1n1

Baloney.


2 posted on 12/02/2019 5:21:32 AM PST by DesertRhino (Dog is man's best friend, and moslems hate dogs. Add that up. ....)
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To: w1n1

Funny how Jack O’Connor never seemed to mention this.


3 posted on 12/02/2019 5:22:15 AM PST by DesertRhino (Dog is man's best friend, and moslems hate dogs. Add that up. ....)
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To: DesertRhino
Baloney.

In other words, about average for 'AM Shooting Journal'.

4 posted on 12/02/2019 5:28:36 AM PST by real saxophonist (Never let Sean Connery teach your dog to Sit!)
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To: DesertRhino

Baloney
***********
Talk to some expert artillerymen or folks at NASA charged with computing the trajectories of rocket launches.


5 posted on 12/02/2019 5:31:57 AM PST by House Atreides (Boycott the NFL 100% — PERMANENTLY)
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To: w1n1
Everything I needed to know about Coriolis effect I learned from Rex.
6 posted on 12/02/2019 5:31:58 AM PST by grobdriver (BUILD KATE'S WALL!)
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To: w1n1

Good to know the next time I need to hit someting 1000 yards away. LOL


7 posted on 12/02/2019 5:32:05 AM PST by dblshot (I am John Galt.)
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To: w1n1

Spent a week training under an excellent long range shooter and former Iraq sniper. He was adamant that coriolis was irrelevant.


8 posted on 12/02/2019 5:32:12 AM PST by ctdonath2 (Specialization is for insects.)
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To: DesertRhino
Baloney.

No, man - it's a real thing for ultra-long distance shooting - more than I will ever do with my weapons, but for some who can reach out there, it's a consideration.

9 posted on 12/02/2019 5:34:46 AM PST by grobdriver (BUILD KATE'S WALL!)
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...the target is moving? So the shooter is not moving in relation to the shooter? In relation to the discharged round maybe. But how fast is the bullet traveling vs the speed which the earth is rotating.

[Wiki] “At the equator, the circumference of the Earth is 40,070 kilometers, and the day is 24 hours long so the speed is 1670 kilometers/hour ( 1037 miles/hr). This decreases by the cosine of your latitude so that at a latitude of 45 degrees, cos(45) = . 707 and the speed is . 707 x 1670 = 1180 kilometers/hr.”

[Wiki] “The average bullet travels at 2,500 feet per second (around 1,700 mph).”

Theory has it that if you’re standing 500 feet away from a shot you have a tiny bit of a chance to actually dodge the bullet.

I can sort of understand the science behind this Coriolis Effect, but what is low equal to? An inch perhaps?


10 posted on 12/02/2019 5:38:32 AM PST by Clutch Martin (The trouble ain't that there is too many fools, but that the lightning ain't distributed right.)
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To: DesertRhino

While this is true, it is pretty much irrelevant for most shooting, long range included.

In fat, coreolis is much more complicated, who shoots in a cardinal direction? Imagine the offset if you shoot at say, 37 deg magnetic at a latitude of 42 deg?

Also, one must include more apparent ballistic influences such as spin drift, aerodynamic jump and precession, manges effect etc.

That’s why one shot hits at unknown distance on field fire ranges seldom result in one shot hits past 600 yard or so. ( unless the target is a barn door).


11 posted on 12/02/2019 5:39:26 AM PST by Manly Warrior (US ARMY (Ret), "No Free Lunches for the Dogs of War")
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To: w1n1
I used to think the coriolis effect affected fluid rotational patterns.

Ever watched the Simpsons go to Australia?

I'm actually a lil curious as to if it actually affects the flower spiraling on cannabis. In the northern hemisphere looking from the top down it spirals CCW going up from what I've observed

12 posted on 12/02/2019 5:40:19 AM PST by rawcatslyentist (https://www.youtube.com/watch?v=yfuAJcWl6DE Kill a Commie for Mommie)
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To: w1n1

Judas Priest. With my vision, I’m happy to hit something 50 yards away.


13 posted on 12/02/2019 5:40:36 AM PST by BBQToadRibs
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To: grobdriver

I would say “Leave the gun, take the coriolis” but I won’t.


14 posted on 12/02/2019 5:51:09 AM PST by HombreSecreto (The life of a repo man is always intense)
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To: w1n1

Ping


15 posted on 12/02/2019 5:53:28 AM PST by Lowell1775
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To: w1n1

I suspect that this is only noticeable on REALLY long shots.


16 posted on 12/02/2019 5:54:37 AM PST by Agatsu77
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To: ctdonath2

I shoot every week out past 1000 yards. The way my land lays, most coyotes are over 1000 when I shoot them too (one was 1760 yards, dead run). I’ll tell anyone knowing your ballistics and equipment and your four marksmanship principles are far more important. Build a range card and learn it. Learning to read wind is also very important and having a good spotter or being able to spot your own shots. Too many people overthink it.


17 posted on 12/02/2019 5:55:47 AM PST by Bulwyf
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To: rawcatslyentist

Yes but if you take another toke it will spiral clockwise going down. This effect alternates from toke to toke.


18 posted on 12/02/2019 5:55:59 AM PST by 1FreeAmerican
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To: grobdriver
No, man - it's a real thing for ultra-long distance shooting - more than I will ever do with my weapons, but for some who can reach out there, it's a consideration.

Not a pro shooter. But I am a bit of a physics buff and ballistics enthusiast. At over 1000 meters, an inch of elevation difference is more relevant than the rotation of the earth. Is there an effect? Sure. But the gravitational effect of the moon on the bullet has an effect too. It is irrelevant to consider as there are significantly more important variables to adjust for.

It's like pissing in the ocean. You have added volume to a contained body of water. Therefore you have actually, single handedly raised the average global sea level. Now go try to measure that.

19 posted on 12/02/2019 5:57:22 AM PST by Tenacious 1
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To: House Atreides

We’re talking man-portable rifles here, not rockets or other things traveling more than dozens of miles in seconds.

Does it exist? Yes. Does it matter for sub-1” projectiles? No.


20 posted on 12/02/2019 5:58:56 AM PST by ctdonath2 (Specialization is for insects.)
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