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Sighting in

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  #1  
Unread 11-18-2010, 09:38 AM
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Join Date: May 2010
Posts: 21
Sighting in

All,

I'm going on a hunt at a altitude that is significantly higher then the elevation that I am sighting in at. Shooting distance is anticpated to be 400-500 yards. I'm sighting in at 2700 feet whereas my hunt will be at +14,000 feet.

How do I calibrate my ballistic turrent for the higher elevation to take out some of the guesswork for holding over? How do I account for the significantly different trajectories at the hunting elevation verses my present altitude that I am sighting in at? I typically sight in so my zero distance is 300 yards which means I need to be about 3 inches high at 100 yards (2700 feet elevation). If I want a 300 zero distance at the planned hunting elevation, the 100 yard path is at 2.5 inches high at the elevation according to JBM ballistics. Does that mean I sight in at 2.5 inches high at 100 at 2700 feet? I don't think its that easy.

Thanks for the feedback. I am so confused.
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  •   #2  
    Unread 11-19-2010, 12:14 AM
    Platinum Member
     
    Join Date: Jan 2008
    Location: West Central Idaho
    Posts: 1,218
    Re: Sighting in

    Just curious what the heck you gonna hunt at 14,000 feet? I was on a peak 13,200 feet in Utah hunting mule deer a few years back and there wasn’t even a track up there of any kind. It’s a butt kicker hunting that high.

    Run your ballistics calculator with all the relevant information for 14000 feet with a 300 yard zero. See where the impact is at 100 yards and re-set the scope too that setting. That will give you a 300 yard zero at 14,000 feet. “Verify” at 300 yards when you get to altitude. A ½ inch change is probably close.
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      #3  
    Unread 11-19-2010, 12:31 AM
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    Join Date: May 2010
    Posts: 21
    Re: Sighting in

    Quote:
    Originally Posted by kcebcj View Post
    Just curious what the heck you gonna hunt at 14,000 feet? I was on a peak 13,200 feet in Utah hunting mule deer a few years back and there wasn’t even a track up there of any kind. It’s a butt kicker hunting that high.

    Run your ballistics calculator with all the relevant information for 14000 feet with a 300 yard zero. See where the impact is at 100 yards and re-set the scope too that setting. That will give you a 300 yard zero at 14,000 feet. “Verify” at 300 yards when you get to altitude. A ½ inch change is probably close.
    Thanks for the response. So I take it is as easy as sighting in for the assumed conditions at altitude. I just wanted to get that verified.

    I'm off to Tajikistan for a marco polo hunt in a couple of months. Just received word that I'll be issued a CITIES permit in the next couple of weeks (about time). Getting myself sorted out now for it now.
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