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Point Blank Range or combat zero

This is a discussion on Point Blank Range or combat zero within the AR Talk forums, part of the Long Gun Talk category; 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 ...

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Old 11-22-2012, 08:19 PM   #1
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Point Blank Range or combat zero

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
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Old 11-22-2012, 09:49 PM   #2
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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
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Old 11-22-2012, 09:59 PM   #3
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The 100 yard zero seems to work best. then work from there. Zen of the 100 Meter Zero - M4Carbine.net Forums AR-15 Zeros and Trajectories - M4Carbine.net Forums
Improved Battle-sight Zero These links may help.
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Old 11-22-2012, 10:07 PM   #4
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Hi,

Thanks guys, I'll check out both links.

- Mike
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Old 11-22-2012, 10:19 PM   #5
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Quote:
Originally Posted by TCS_XDM View Post
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
Great Video. Really explains the differences. Combat effective zone is same as PBR.

Thanks. That helps a lot.

- Mike
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Old 11-22-2012, 11:00 PM   #6
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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
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Old 11-23-2012, 08:32 AM   #7
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Quote:
Originally Posted by Rob2 View Post
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
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
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Old 11-25-2012, 08:17 PM   #8
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Hi,

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

- Mike
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Old 11-26-2012, 12:22 AM   #9
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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.
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Old 11-26-2012, 11:21 AM   #10
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Quote:
Originally Posted by Fdxpilot View Post
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.
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
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