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Spin Drift

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  #8  
Unread 09-29-2013, 10:40 AM
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Join Date: Apr 2012
Location: Terre Haute In.
Posts: 693
Re: Spin Drift

What ballistic calculator are you using if any? I use shooter and just add in the SD and Corolis automatically. My buddy just sights his rifle in 1/4" left at 100yds. and has good results. Actually the 1/4" left is the same method Mike Davidson and Bob Beck both use. I have spoken with both of them and they both told me the same thing.
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  •   #9  
    Unread 09-29-2013, 10:44 AM
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    Join Date: Apr 2012
    Location: Terre Haute In.
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    Re: Spin Drift

    Quote:
    Originally Posted by Kurt View Post
    The most accurate example of the mentality of S H members I have seen. Thanks for posting.
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      #10  
    Unread 09-29-2013, 11:05 AM
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    Join Date: Mar 2012
    Location: Elk Garden,WVa
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    Re: Spin Drift

    According to JBM. If I punched in the proper info. It's only showing 4" of drift for my setup. 3000 elevation-180 berger-3275 fps.????
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      #11  
    Unread 09-29-2013, 11:09 AM
    BMF BMF is offline
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    Join Date: Jul 2008
    Location: Near Fowler/St Johns...Michigan
    Posts: 170
    Re: Spin Drift

    It sounds like your over thinking it a bit. First off, it should only be 4-6in at 1000yds. All i I do is incorporate a little cheat chart on my field drop chart. It's something like this for my 30WM:
    Spin Drift
    Move right MOA
    200-400 =.2
    500-600 =.3
    700-800 =.4
    850-900 =.5
    650-1000=.6

    You could also use inches if you don't have a MOA reticule. Which would be for example: 700-800yds=.4
    so. .4 x 1.076=.43in ----.43 x 7.50 ( 750yds)=3.2in
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      #12  
    Unread 09-29-2013, 11:21 AM
    BMF BMF is offline
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    Location: Near Fowler/St Johns...Michigan
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    Re: Spin Drift

    Quote:
    Originally Posted by oldmossy View Post
    According to JBM. If I punched in the proper info. It's only showing 4" of drift for my setup. 3000 elevation-180 berger-3275 fps.????
    You posted it while i was typing ^^^^^^^^

    I like the 1/4 in. left zero method too. Definatly faster.
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      #13  
    Unread 09-29-2013, 12:56 PM
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    Join Date: Sep 2013
    Posts: 3
    Re: Spin Drift

    Negative. It works in relation to time of flight, not distance.
    It is not an angular issue.
    My 6 BR has about 9" at 1000yds, but only 1.8 at 500.
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      #14  
    Unread 09-29-2013, 05:02 PM
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    Join Date: Jan 2009
    Location: mobridge
    Posts: 190
    Re: Spin Drift

    Quote:
    Originally Posted by rick523 View Post
    The most accurate example of the mentality of S H members I have seen. Thanks for posting.

    ya seems frank has a sense of humor and more rounds down range than most. Didn't realize there was some special kind of mentality of SH
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