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dont know what to do

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  #1  
Unread 03-20-2011, 06:32 PM
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dont know what to do

I went shooting today to practice for my first 1000 yard shoot I shoot a 6.5 284 that i built its got a 28 inch barrel with the ratchet 4 riflings in it i shoot 140 gr berger and have a ballistics program on my i pod i shot at 220 yards without making adjustments it was 2.5 inches low then i shot it out at 420 yards and was 21 inches low then went to 600 and i had to dial up 9 moas i put that in my program and it said i had a bc of 1.75 i shoot 2970 fps just was wondering if someone had any ideas. im lost i was also shooting at 3270 feet elev. every thing matches for that bc
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  •   #2  
    Unread 03-20-2011, 06:51 PM
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    Re: dont know what to do

    Are you sure about your FPS Did you chrono the loads at around the same temp/alt?
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      #3  
    Unread 03-20-2011, 06:58 PM
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    Re: dont know what to do

    ya i ckecked it through two diff cornys
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      #4  
    Unread 03-20-2011, 06:58 PM
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    Re: dont know what to do

    Quote:
    Originally Posted by doublebull View Post
    I went shooting today to practice for my first 1000 yard shoot I shoot a 6.5 284 that i built its got a 28 inch barrel with the ratchet 4 riflings in it i shoot 140 gr berger and have a ballistics program on my i pod i shot at 220 yards without making adjustments it was 2.5 inches low then i shot it out at 420 yards and was 21 inches low then went to 600 and i had to dial up 9 moas i put that in my program and it said i had a bc of 1.75 i shoot 2970 fps just was wondering if someone had any ideas. im lost i was also shooting at 3270 feet elev. every thing matches for that bc
    Your ballistic program should have a basic set of information to input, then it will give you a drop chart that should be relatively close to reality.

    If you can provide some more details, I am glad to run the numbers in Exbal and post the drop chart that it produces. Here's what we have and need....

    Bullet: 140grain Berger VLD (or is it the Long Range hollow-point boattail?)
    BC: .612 for the VLD (the LRHPB is .618)
    Muzzle Velocity: 2970
    Elevation: 3270
    Site-in Temperature: ??
    Scope Height (distance from center of bore to center of scope): ??
    Site-in Distance: 100yards?
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    I'm not gonna shoot here. I'm gonna shoot waaaaaaaay over there!
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      #5  
    Unread 03-20-2011, 07:10 PM
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    Re: dont know what to do

    it is 1.5 in scope hight 50 deg its the vld i ran the bc .612 and it said 10.9 moa but the moa i used to be on target was 9 moa and i produced a 3 inch group at 600
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      #6  
    Unread 03-20-2011, 07:39 PM
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    Re: dont know what to do

    You were 2.5 low at 220. So, I re-ran your numbers with a 220yd zero using NF Bal.

    @ 420yds, it shows you would have a 19" drop. Then, you would add another 2.5" because you weren't exactly zeroed at 220. Hence, you should've been 19+2.5=21.5" which is close to the 21" you stated.

    @ 600yds, it shows you would have a 56.5" drop or ~9 MOA elev adj. Then, you would add another 2.5" because you weren't exactly zeroed at 220. Hence, you should've been 56.5+2.5=58" which is still close to the 9 MOA you stated.

    @ 1000yds, it shows you will have a 231.1" drop or ~22 MOA elev adj. That should leave you about 2.5 low.

    That's not the most scientific method. But, it should get you on paper or steel.

    How many rounds have you chronied and how consistent is your MV?
    That will be a big factor.

    Good luck!
    Richard
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      #7  
    Unread 03-20-2011, 07:50 PM
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    Location: Idaho
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    Re: dont know what to do

    I entered your info into my program and got
    36 clicks to get to 600 yards or 9MOA

    700=48 clicks(12 MOA)
    750=54 clicks(13.5 MOA)
    800=60 clicks(15MOA)
    850=67 clicks(16.73 MOA)
    900=74 clicks(18.5 MOA)
    950=81 clicks(20.25MOA)
    1000=88 clicks(22 MOA)
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