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Need help Calculating how high to sight at 100 to hit at 500

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  #1  
Unread 07-22-2010, 09:20 PM
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Join Date: Feb 2009
Location: Upstate NY near Cooperstown
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Need help Calculating how high to sight at 100 to hit at 500

Can anybody with the Sierra ballistics program, or any program, help me out and tell me how many inches high I need to be at 100 yards to be on at 500?

I have 2 guns I need to know this for:

The first is a 6BRX with the Berger 108 BT (.243) traveling at 3050 FPS.

The second is a .308 with the 168 SMK (.308) traveling at 2,700 FPS.

The following is the same for both: They are both zeroed at 100 yards. The altitude would be 2,000 feet above sea level and temps at 75 degrees.

I can’t find my Sierra program and I need this information by Saturday so I don’t waste a bunch of ammo getting on target. My guess is that I probably need to be about 9 inches high at 100 for the 6BRX, and about 11 for the .308?

Thanks so much to anyone who can help me out.
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  •   #2  
    Unread 07-22-2010, 09:51 PM
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    Re: Need help Calculating how high to sight at 100 to hit at 500

    I'll take a stab, 6mm is 7.54 MOA and 10.65 MOA for the 308, using Bergers ballistic program.
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      #3  
    Unread 07-22-2010, 10:09 PM
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    Re: Need help Calculating how high to sight at 100 to hit at 500

    Go here. JBM - Calculations - Trajectory

    Fill it out and set the "Zero Range" to 500. Make sure "Elevation Correction for Zero Range" down at the bottom is checked. Click Calculate, then look at the Drop (in) column for your "inches high" at 100.
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      #4  
    Unread 07-22-2010, 11:35 PM
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    Re: Need help Calculating how high to sight at 100 to hit at 500

    Quote:
    Originally Posted by thorbird View Post
    Can anybody with the Sierra ballistics program, or any program, help me out and tell me how many inches high I need to be at 100 yards to be on at 500?

    I have 2 guns I need to know this for:

    The first is a 6BRX with the Berger 108 BT (.243) traveling at 3050 FPS.

    The second is a .308 with the 168 SMK (.308) traveling at 2,700 FPS.

    The following is the same for both: They are both zeroed at 100 yards. The altitude would be 2,000 feet above sea level and temps at 75 degrees.

    I canít find my Sierra program and I need this information by Saturday so I donít waste a bunch of ammo getting on target. My guess is that I probably need to be about 9 inches high at 100 for the 6BRX, and about 11 for the .308?

    Thanks so much to anyone who can help me out.
    What's your scope height?
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      #5  
    Unread 07-23-2010, 05:39 AM
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    Re: Need help Calculating how high to sight at 100 to hit at 500

    I used JBM and see the 6BRX as 9.0" high and the .308 at 12.5" high, at 100yds. The only thing I "assumed" was the 1.5" scope height. I use JBM exclusively and when dialed in for 500yds my rifles are usually within an inch or two of being dead on, elevation wise. The windage is a beast unto itself. I usually go with the standard 10MPH crosswind and make an adjustsment after the first shot. I believe this will get you on paper at 500yds. Good shooting! JohnnyK.
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      #6  
    Unread 07-23-2010, 07:01 AM
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    Location: Upstate NY near Cooperstown
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    Re: Need help Calculating how high to sight at 100 to hit at 500

    Wow. I was hoping someone would respond, and here I got all this great info including learning about JBM.

    Thanks a bunch.
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      #7  
    Unread 07-23-2010, 07:18 AM
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    Re: Need help Calculating how high to sight at 100 to hit at 500

    JBM is a good tool, I use it to check my field programs against. I've been using the one on the Berger web site lately to see how it works, it is way simple!
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