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POI DISTANCE

Discussion in 'Shooting Related Threads' started by BigJohn270, Apr 19, 2010.

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  1. BigJohn270

    BigJohn270 Member

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    Wondering at what distance you check your point of impact?
    I am trying to set the comb on my gun.
    I am wanting to have about a 65/35 or 70/30 pattern.

    Thanks for the help
     
  2. mixer

    mixer Well-Known Member

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    I believe Neil Winston has said that 13 yards is ideal for setting POI. There is a math formula involved in that 1" high/low/left/right at 13 yards is 3" at 33 yards, I may be wrong on the math but I'm sure others will have the right numbers. POI is not patterning, IMO patterning is best done at 35-40 yards to see what percentage of shot falls in to a 30" circle and shows core density in a 20" circle.

    Eric
     
  3. BigJohn270

    BigJohn270 Member

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    You are right, I am looking for POI not patterning.
     
  4. ivanhoe

    ivanhoe Well-Known Member

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    BigJohn270 13 yds off a rest shot like a rifle.


    Bob Lawless
     
  5. Mark425

    Mark425 TS Member

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    Someone told me that for every inch your POI is off at 16 yards, move the comb 1/16 inch in the direction needed to correct. I found that easy to remember 1 inch at 16 yards equals 1/16 in at comb. I am sure that’s not exactly mathematically correct but it gets you darn close. Then for me, it was off to 40 yards for the fine tuning of my POA (not POI). Next...I lock the trap on straight aways and see how I did. Most time is was close and I made some minor adjustments from there.
     
  6. BigJohn270

    BigJohn270 Member

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    So if I have a POI that looks to be 60/40 at 13-16 yrds, then I should have a POI of 60/40 at say 30 yards?
     
  7. BigJohn270

    BigJohn270 Member

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    thank you, that is what I think I need.
     
  8. Hap MecTweaks

    Hap MecTweaks Well-Known Member

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    John, not knowing your rib height, once you use the guide posted by Shawn above, confirm the pattern center at longer yardages. It works close enough for some shotguns and not for others.

    Hap
     
  9. E. Beaver

    E. Beaver Member

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    Please bare in mind that if you set you POI at 13 yards you should account for the fact that shot will dorp about 4 inches at 40 yards.

    Charlie
     
  10. Hap MecTweaks

    Hap MecTweaks Well-Known Member

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    Charlie, if you ever shoot shotguns and slugs and use that thinking, you'll see that 4 inches of drop is from the centerline of the bore. Once you regulate the elevation of the centerline upward, your compensating for that 4 inches of drop. You can't make that subtraction twice. That goes for slugs as well as a equal weight and velocity of shot!

    Hap
     
  11. scooterbum

    scooterbum Active Member

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    Hap,

    The second subtraction is for the effect of gravity between 13 and 39 yards. The shot is not riding in a vacuum.
     
  12. Hap MecTweaks

    Hap MecTweaks Well-Known Member

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    Longshooter, set the guns POI with the centerline of the bore then measure the drop, it will be near 4 inches. The load or slug certainly doesn't drop 8 inches in 39 yards!! Try it for yourself instead of passing along something someone else said or believes!

    Hap
     
  13. scooterbum

    scooterbum Active Member

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    Try point of impact vs line of sight.
     
  14. Hap MecTweaks

    Hap MecTweaks Well-Known Member

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    Try POI versus centerline of bore. Hap
     
  15. scooterbum

    scooterbum Active Member

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    Tell me, how do you look through the bore of your shotgun, while you are shooting it?
     
  16. Hap MecTweaks

    Hap MecTweaks Well-Known Member

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    Longshooter, if you truly want to know how to properly do this, email me and I'll explain the process. If it's an argument you want, it's over. Remove the X from my email address above if you want.

    Hap
     
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