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POI percentage

Discussion in 'Uncategorized Threads' started by butcher, Jul 23, 2008.

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  1. butcher

    butcher Member

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    First, what is Neil Winston's formula for POI.
    How many inches high from aim point determine 60/40, 70/30. 80/20, 90/10and 100%?
     
  2. Shooting Coach

    Shooting Coach Well-Known Member

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    At 13 yards, with a full choke, you can easily guesstimate the percentage. With a 30" pattern, 50/50 is 15" high and low. Add three inches to the height and subtract the same from under the front bead for every 10%.

    60/40= 18" above the front bead, 12" below

    70/30= 21" and 9"

    80/20= 24" and 6"

    90/10= 27" and 3"

    100% is 30" above the front bead to right at the front bead.

    I personally prefer at least 80/20 for ALL games, even Skeet. My favorite Skeet gun shoots about 90/10 with bottom barrel, and right at 100% high with the top barrel. It is also ULTRA DEADLY on Trap and Bunker. I use the Top barrel for the back fence and first shot of ATA Dubs. This IS a "does-it-all" gun.

    Your mileage will probably vary.
     
  3. dmarbell

    dmarbell Active Member

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    Here is a graphic that illustrates what Shooting Coach said, above.

    Danny

    <a href="http://s188.photobucket.com/albums/z16/dmarbell/Trapshooters/?action=view&current=POI.jpg" target="_blank">[​IMG]</a>
     
  4. John Thompson

    John Thompson TS Member

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    Aug 22, 2007
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    Shooting Coach, how do you get a 30" pattern at 13 yd.? Shoot 5 shots from a rest, with a point of aim marked on the pattern sheet. Measure the diameter of the pattern. A 60/40 will be "pattern over point of aim divided by pattern diameter = % of pattern" ie 18"/30" = 60% (100-60=40 ergo 60/40

    Typically patterns are determined at 40 yd.s but you can be close at less yardage.
     
  5. miketmx

    miketmx Well-Known Member

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    The Neil Winston method of shooting at 13 yards is based on the fact that it is pretty difficult to accurately find where the center of the pattern is when shot from 40 yards.
     
  6. zzt

    zzt Well-Known Member

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    to answer your question directly, at 13 yards 1" above POA = 60/40, 2" = 70/20, 3" = 30/20, and so on.

    At 40 yards, 3" = 60/40, 6" = 70/20, etc.
     
  7. mercedesman1981

    mercedesman1981 TS Member

    Joined:
    May 11, 2007
    Messages:
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    John, so determine the POI at 13yds, multiply by 3 for 39yds. You will be pretty close to actual as I have proven this myself on several occasions.

    Nice chart Danny.

    Mike
     
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