Point Blank Range or combat zero

Discussion in 'AR Talk' started by mbrando, Nov 22, 2012.

  1. mbrando

    mbrando XDTalk 100 Member

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    Hi,

    I'm new rifles and have been thinking about how to go about zeroing my rifle. At first I watch youtube videos and read some threads here on combat zero. Zero at 25m that makes for a 300M zero with a peek of about 8.3 inch above line of sight. Generally I'm shooting in tactical matches with ranges from 20 to 200m .

    I went here to get some basic numbers ShootersCalculator.com

    and they have a calc for PBR, Point Blank Range.
    ShootersCalculator.com | Point Blank Range Calculator

    Basically you put in your cartridge data and target size and give you a near and far zero with an estimated high or low zero at 100 years to keep your bullet on target while only having to point at line of site.

    Does anyone use this method with their rifle? The idea is that you don't have memorize hold point for various ranges as long as you are inside the max PBR.

    You can obviously still use hold points for more bulls eye type shooting, but with a PBR for a 6 inch target with 223 ammo you'd set your 100 yard zero about 2.18" high and that you allow you to use simple line of sight out to 311 yards, in theory.

    Comments? It seems like your flattening out the trajectory to make for high and low on target size.

    - Mike

     
  2. TCS_XDM

    TCS_XDM XDTalk 1K Member

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    Here is a general idea. I suggest if you have the ability to go out and do this with your specific ammo, barrel, height over bore of optic....... It will give you the specifics for your ballistics.

    https://www.youtube.com/watch?v=8iCNIRuQuBg
     
  3. Sunday

    Sunday XDTalk 1K Member

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  4. mbrando

    mbrando XDTalk 100 Member

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    Hi,

    Thanks guys, I'll check out both links.

    - Mike
     
  5. mbrando

    mbrando XDTalk 100 Member

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    Great Video. Really explains the differences. Combat effective zone is same as PBR.

    Thanks. That helps a lot.

    - Mike
     
  6. Rob2

    Rob2 XDTalk 1K Member

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    With my AR in .223/5.56 16"bbl. i zeroed at 50yds. and it comes out to be zeroed for right around 218yds. Being about 1" high at 100yds.

    I dont shoot competitions with it though. But it works fine for me cause anywhere 50-200yds will only be an inch or less high
     
  7. mbrando

    mbrando XDTalk 100 Member

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    Hi,

    Thanks. I have a 16" barrel too. I'm thinking I'll try setting a near zero at the range closest to me to day and confirm the far zero later at a range with a longer rifle bay.

    - Mike
     
  8. mbrando

    mbrando XDTalk 100 Member

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    Hi,

    Back from the range today. Decided that the 200 yard zero works best for what I'm doing.

    - Mike
     
  9. Fdxpilot

    Fdxpilot XDTalk 1K Member

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    This is what I got inputting info from XM193 in a 16" barrel Using 2.6" sight height.

    Near Zero:49 yards
    Far Zero:221 yards
    Minimum PBR:9 yards
    Maximum PBR:253 yards
    Sight-in at 100yds: 1.61" high

    Fits in very well with the 50yd/2xx yd (depends on ammo and barrel) zero.
     
  10. mbrando

    mbrando XDTalk 100 Member

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    Hi,

    Yup, that looks about right. The tricky part is if getting the correct velocity out of you rifle. I don't have a chronograph to test ammo with my rifle so I was guess a few FPS drop for 16 inch barrel, 3050 vs. the 3165 federal has on their site out a 20" barrel.

    - Mike
     
  11. bigred1

    bigred1 XDTalk 500 Member

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    Thanks for the information guys, I just finished my 16" and have been reading up on range zeroing reports. This thread helped, thanks.
     
  12. mbrando

    mbrando XDTalk 100 Member

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    You're welcome. I really found the link to the different zeros types explains helpful.

    - Mike
     
  13. JXDR

    JXDR XDTalk 100 Member

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    Great thread. Thanks everyone!
     
  14. towerofpower93

    towerofpower93 XDTalk Member

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    I do the same; makes the moderate range shooting much easier. Just have to remember when shooting up close to aim high center chest in order to stay in the A zone.
     
  15. Rob2

    Rob2 XDTalk 1K Member

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    Same here, for close ranges i guesstimate mostly but holding about halfway down my front sight post gets me close enough to where i need to be but most people have optics on their ARs too not just irons lol

     

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