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alltitude

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  #1  
Unread 01-14-2008, 10:37 PM
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alltitude

I live at 50 feet above sea level I go hunt wyoming every year for deer and antalope my question is if I set my gun up to shoot here for deer hunting then go to wyoming where it is 4500 feet how will this affect the bullet. will I have to switch the dials, change impact and that whole thing.
I have not got the dials or anything to start.
Just asking questions before I start.

Thanks,
Zach
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  •   #2  
    Unread 01-15-2008, 01:01 AM
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    Zach

    The higher you go the thiner the air.

    The bullet will impact higher if the temp and humidity are the same as
    at sea level.

    The best thing to do is plan on sighting in at a minimum of 3 different
    yardages (100,300 and 500yrd,s to establish your trajectory at that
    elevation.

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      #3  
    Unread 01-15-2008, 07:40 AM
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    The best thing to do is use JBM Eskimo and enter all of your data from where you normally shoot and record that information. Then go back and change the altitude input to what you hunt at in Wyoming. Take note of the difference.


    For one of my rifles, these are the affects of temperature and altitude on the point of impact.

    Effects @1000 yards
    10 Degrees F = 0.1 inches of drop
    1000 ft elevation = 0.2 inches of drop

    So if my drop chart or dial was established at sealevel and I hunted at 5000 feet ( 5 X 0.2 = 1.0) I would be off by exactly 1.0 MOA at 1000 yards which is 10 inches or more.

    Temperature changes can be computed similarly.
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      #4  
    Unread 01-15-2008, 09:34 AM
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    Altitude

    [QUOTE=Buffalobob;184556]The best thing to do is use JBM Eskimo and enter all of your data from where you normally shoot and record that information. Then go back and change the altitude input to what you hunt at in Wyoming. Take note of the difference.


    For one of my rifles, these are the affects of temperature and altitude on the point of impact.

    Effects @1000 yards
    10 Degrees F = 0.1 inches of drop
    1000 ft elevation = 0.2 inches of drop

    So if my drop chart or dial was established at sealevel and I hunted at 5000 feet ( 5 X 0.2 = 1.0) I would be off by exactly 1.0 MOA at 1000 yards which is 10 inches or more.



    Good information BOB

    Where do you find JBM Eskimo on line ?

    "Help"I'm still trapped in the 70,s and trying to get out.

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      #5  
    Unread 01-15-2008, 11:20 AM
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    Zach,

    what are you shooting ?

    Rifle, load data, velocity, zero... etc.

    thanks
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      #6  
    Unread 01-15-2008, 02:29 PM
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    Sorry, I thought it was common knowledge. Here is the link. If you do not understand some of it just ask.


    JBM - Calculations - Trajectory
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      #7  
    Unread 01-15-2008, 05:12 PM
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    Quote:
    Originally Posted by Buffalobob View Post
    Sorry, I thought it was common knowledge. Here is the link. If you do not understand some of it just ask.


    JBM - Calculations - Trajectory
    Sorry BOB

    I use the JBM all the time, It was the (ESKIMO) that threw me off.

    Thanks
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