Home Forums Hunting & Shooting Long Range Hunting 7mm Remington Magnum, 180 ELD-M, 1683 Yards

That author talks about centrifugal force, which is sometimes referred to as an inertial force or a fictitious force. This is because it’s really just a result of measuring motion from a non-inertial reference frame. What that really means is that it’s not necessarily a force at all, but a change in motion of one object with respect to another due to the reference frame accelerating.

Take the car example- the author describes you driving a car around a corner, and you feeling a force throwing you outward. There is no force that does this. What is really happening is that your body had momentum going straight. If the car were to suddenly vaporize or disappear, your body would keep going straight until it hit the ground and started tumbling. So your body wants to keep going in a straight line because it has forward momentum. When the car turns, it’s “forcing” (see what I did there) your body to change direction, which changes its momentum. What you feel is the centripetal force coming from the car pushing your body toward the center of the radius of the turn.

The earth is similar, in that it changes its direction, but because the bullet is not connected to the earth, like your body is connected to the car, the bullet does not move with the earth, so when the earth drops down a bit, and the target with it, the bullet does not follow the same motion, and continues on its original trajectory, causing the target to drop out from under it. You could discuss the effects of this motion in an inertial reference frame, and use forces like gravity to do so, but I find the inertial description much simpler and easier to understand. When the bullet is in flight, the earth/target drop out from under it, or they rise into the bullet, depending on which direction you’re shooting.

Well explained Jordan. Thank you.

Very interesting..!!!

Another plus one and thanks to Jordan. And to RC for posting.

Good explanation Jordan. I wonder what the Flat Earthers would say?

😂😂😂😂

You're on here spouting knowledge non stop....acting like King Schittt......and you don't take an azimuth of fire when shooting over a mile and didn't "look" at Coriolis? WOW!

Thanks jj. Actually 1683 yards is less than a mile.


....and there's no need for formalities; you can just call me "King"

I'll call you "Einstein"

LOL

ahem ... yall are assuming that the earth is a sphere

No, we're just assuming that it spins on an axis

Interesting,
Sight in and gather data north to south....lets say you do this and your dope is right. If you are using a ballistic calculator (in my case a Kestrel with AB) will the "coriolis" feature auto-correct the data when shooting east and west?

Yes, it should. When you zero your rifle at 100 yards, the effects due to the earth's rotation are so small that they're negligible.

It does. In Ballistic AE when you set up the profile for your confirmed drops make sure you put in the azimuth of fire when developing. When you load the profile in the HUD for use (and probably shooting in a different direction) put in the azimuth of fire. It automatically changes output data to correct for Coriolis

I'm going to have to test this a little and see what I learn.

What was the load for this? I'm curious about which powder is producing what velocity in a 7RM with 180's.

Does earth rotation have a noticeable effect shooting north/south.
When I have seen it mentioned, I always thought north/south, the target mooving laterally while the bullet was in flight.

I never made the east/west connection.

Learned something new already this am.

67 grains H-1000/Fed215/Nosler Case/180 ELD-M/2900fps

Factory Barrel



When shooting North or South, impacts will be left or right of the POA but I think wind and spin drift have more effect

Factory barrel, eh? Damn nice. What elevation are you at?

You need to switch to left hand rifling..

http://www.appliedballisticsllc.com/Articles/ABDOC108_GyroscopicAndCoriolis.pdf

1 mile