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POI Question

Discussion in 'Shooting Related Threads' started by tomc66, Aug 10, 2009.

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  1. tomc66

    tomc66 Member

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    What does 90/10 or 80/20 POI mean??
     
  2. timb99

    timb99 Well-Known Member

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    Generally, this is not a totally accurate way to explain POI, but it has been in common use for a long time.

    If you're patterning your gun at a typical patterning distance (say 30 to 35 yards for singles, a little longer for handicap) and you "aim" your bead at a fixed point on the pattern board, a 50/50 pattern would put half the pattern above the point of aim, and half the pattern below.

    A 100% POI would put ALL the pattern above your point of aim.

    60/40, 70/30, 80/20, and 90/10 are varying degrees in between those extremes.

    It really makes more sense to say "at 32 yards, the center of the pattern is ?? inches above the point of aim."
     
  3. Andy44

    Andy44 Active Member

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    POI (point of impact) ratio is the % of pellet hits above/below POA (point of aim)

    AndyH ;-)
     
  4. tomc66

    tomc66 Member

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    I shoot a Remington 1100 with a 30" full choke barrel. Would a 100% POI be desirable for this gun?
     
  5. timb99

    timb99 Well-Known Member

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    What POI you choose is totally up to you and how you shoot.

    You adjust POI by adjusting the height of the comb. If your comb is not adjustable, you're kind of stuck with where it shoots, unless you file off some wood (to lower the POI) or add some material like moleskin (to raise the POI.)

    Only you can say how high your POI should be.
     
  6. tomc66

    tomc66 Member

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    What is the proper method to determine the pattern and POI? Is 32' the proper distance? How large of a paper target should I use?
     
  7. Andy44

    Andy44 Active Member

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    Do a search on "shotgun patterning" and be ready to be impressed with the number of hits you'll get! Many ideas presented.

    AndyH ;-)
     
  8. mixer

    mixer Well-Known Member

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    For 16 yds 32-33 yards from the target is ok. You'll want a piece of paper at least 3 ft square. Put a large mark in the center and see the results.

    Eric
     
  9. zzt

    zzt Well-Known Member

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    tomc66, 60/40, 80/20, etc. describe the height of an idealized 30" pattern above POA at 40 yards. Almost no one realizes that is the reference, so what they think you mean is most likely something other than reality.

    I agree with timb99 and many other who say the most unambiguous way to describe POI is X" high @ Y distance.

    The way to adjust POI is by shooting on the line with the trap locked to throw straight aways. Adjust your comb and or rib until you are consistently smoking targets. The move to post 1 and 5 and repeat. When you are happy with the results, go and find out what your POI is for the record.

    Any distance between 13 and 20 yards will do. Just remember what distance you used. Let's suppose you use 15 yards. Buy a roll of the red rosin paper at your local hardware store. Cut a sheet and put it on the pattern board. Draw three horizontal lines on it. Then stand 15 yards away and track the horizontal line with your bead. Use a full choke and fire whenever. The only thing that counts is you pull the trigger when the bead is on the line. You don't care about right and left. Do this three or four times on each line.

    Now go measure how far above the line the hits are. Discount the fliers and average the rest. Let's say the average is 5" high. Record that result as 5" high@ 15 yards.

    Now you have a reference for what the POI is that gave you the best results on the line. So if you are ever experimenting or upgrading, you always have a reference to return to. Just set up at 15 yards and keep adjusting until the hits average 5" above the line and you are back to where you started.
     
  10. senior smoke

    senior smoke Well-Known Member

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    vic reinders told me to forget patterning with paper. he said years shooters took a soda can, placed it around 20 yards in front of them and shot at it. if the gun shoots high, you will see a long mark from the shot in the grass that went over the can. if the gun shot low, you will see the long mark from the shot in front of the can. if you hit the can, it shoots dead on. back to basics!!
    steve balistreri
     
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