Coriolis effect???

Discussion in 'Long Range Hunting & Shooting' started by Straight Shooter, Sep 21, 2019.


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  1. Buck1970

    Buck1970 Active Member

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    Thanks guys. It’s like there needs to be a long range for beginners forum.
     
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  2. waveslayer

    waveslayer Well-Known Member

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    It is a factor at ELR shooting. Just plug in all the info into a good ballistics app and it will calculate it for you.

    Yes it can be a factor, just use an app and let it do all the work. As long as, the data going in is good, the data coming out will be good
     
  3. milo-2

    milo-2 Well-Known Member

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    Your best bet may be to find an accomplished shooter and shoot with him, and there a lot of LR shooters in your state.
    Just do not ever over complicate this stuff.
     
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  4. DavidleeCole

    DavidleeCole Well-Known Member

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    Coriolis effect in the horizontal plane Is the same irrespective of the direction of fire and in the northern hemisphere it is always right so correct left. In the vertical plane you take the cosine of the azimuth and multiply it by the 90° correction. This accounts for elevation correction due to east or west shots. East will have you high and west will have you low. The main factors are latitude, direction of fire and time of flight that will determine the needed correction. For me I like to correct for as much as I can so I will have a precise point of aim and that allows me to center my cone of fire as best as possible.
     
  5. jfolanddvm

    jfolanddvm Member

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    So... this is how my little brain had to think of it - maybe this will simplify the concept (or maybe make it more complicated). It's not just that the target is moving and thus is in a different spot than it was when the bullet left the muzzle (because the muzzle, and thus the bullet is moving also), but that the muzzle and the target are moving at different speeds. At the equator, or at least at the greatest circumference vertical to the axis of rotation, the surface of the earth is moving at about 1038 mph or a little over 1522 feet/sec. As you move away from the equator, the circumference vertical to the rotational axis becomes smaller, so the distance traveled in 24 hours becomes less - consequently, the surface speed is less. If you are shooting south to north (in the northern hemisphere), the west to east (left to right) speed of the muzzle, and hence of the bullet leaving that muzzle is greater than the west to east speed of the target, so the bullet ends up right of the target (although not by much, as stated earlier). If shooting north to south, the target is moving west to east (right to left) faster than the muzzle, so the target moves farther during the flight time, and the bullet still ends up right of the target. But until I shoot a heck of a lot better than I do now, I don't think I will need to waste time calculating surface speed differentials!!
     
  6. PNWdude67

    PNWdude67 Active Member

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    Love what Revic is doing and combining technology... however for hunting it’s a no go in Oregon... what states allow electronic range and ballistic calculators to be mounted on the rifle system? I can always check google too I suppose for the other states I hunt.
     
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  7. WalksLikeADeer

    WalksLikeADeer Well-Known Member

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    They don't have to mounted on the rifle to be illegal in Oregon. The Sig BDX system is illegal for hunting in Oregon. Components of the system can be used but not the complete system used together.
     
  8. joseph singleton

    joseph singleton Well-Known Member LRH Team Member

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    AMEN
     
  9. PNWdude67

    PNWdude67 Active Member

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    True, and it’s the “BDX component” (“scope”) mounted to the rifle receiving a signal from the LRF that makes it illegal correct?

    (For clarification of those unaware of exactly what we are discussing here’s the ODFW the regulation change hilited in the 2019 PDF)

    “it is unlawful to hunt game mammals with:
    •infrared, night vision, laser, or any other sight that projects a beam to the target, including scopes with electronic rangefinders and scopes that receive information from any electronic device.”

    Key words:
    “sight” and “scopes” which are generally mounted to the weapon system.
     
  10. JCow14

    JCow14 Well-Known Member

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    jfolanddvm said it pretty good! It does get more interesting if you are in South America or North Alaska and you have a counter clockwise/ left twist barrel also The mirage will play funny tricks on you too in the heat of the day!
     
  11. dfanonymous

    dfanonymous Well-Known Member

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    So that includes a rangefinder independent of a scope? Does one just guess their archery shots?
    Not that I’ll every go back to Oregon. I escorted a buddy back to his family in Portland...hung out for a few days by myself and gotta say...not a fan.
     
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  12. RYEWSKY25284

    RYEWSKY25284 Well-Known Member

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    Lotta ANTIFA in Oregon. Very Socialist type of town