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Jicko
05-01-2008, 11:10 AM
What's the preferred ZERO distance for EOTech (CQC redot sights)?

Anyone have info as to what our guys in the sandbox do (or prefer)?
And what's our SWAT/police do (or prefer)?
And maybe 3guns/tactical rifle match guys?

Should I use this @ 25m and then it will be zero'ed @ 300m?? (is there something else I can use, this one is very particular.... and you need to monitor the point of impact and point of aim.... is there another formula... like zero @ 30yds = zero @ 300yds? something like that?)
http://www.eotech-inc.com/documents/M16A4-M4MWS_EOTech_Live_Fire_Target.pdf

GenLee
05-01-2008, 11:20 AM
Tagged for info

OutlawDon
05-01-2008, 11:28 AM
I'd go with 50 yards.

http://groups.msn.com/TheMarylandAR15ShootersSite/zeroingmethods.msnw

mrjones98
05-01-2008, 11:44 AM
I sighted my EOTech for 50yds and just tried my first 3-gun match last month. While I didn't do so well with the longer distance shots, I don't think that was a result of my zero. Worked pretty well for the CQB-type targets and I was still able to hit the 150yd and 350yd targets.

savasyn
05-01-2008, 11:54 AM
I agree, go with 50. I believe 50 and 200 yards are the same POI with it slightly high at 100.

C.G.
05-01-2008, 11:58 AM
My Beowulf sports an Eotech, also zeroed at 50 yards. But then again, the Beowulf is not a long range gun.

FlyingPen
05-01-2008, 12:00 PM
I'm gonna add a follow on question but what makes sense for a zero on a 1.5x to 5x short dot type optic on an AR?

OutlawDon
05-01-2008, 12:15 PM
I'm gonna add a follow on question but what makes sense for a zero on a 1.5x to 5x short dot type optic on an AR?

Same thing....go with 50 yards. The trajectory of the ammo didn't change just because you are using different optics vs an Eotech. I have 1-3x20 Weaver V3 and plan on zeroing at 50 yards.

FlyingPen
05-01-2008, 12:16 PM
How do you like that optic? I heard it's very good value.

OutlawDon
05-01-2008, 12:18 PM
How do you like that optic? I heard it's very good value.


It's awesome for the price....sharp and clear, and it's a true 1x at 10 yards and beyond.

http://www.calguns.net/calgunforum/showthread.php?t=98215

http://healthbydon.com/ar15weaver.jpg

Lethal_addict
05-01-2008, 12:43 PM
Zero Distance for 3-inch Maximun Ordinate

1) Rifle Cartridge .223 Remington [5.56 NATO] & .270 Winchester
is 250 Meters.

2) Preliminary zero is used with 3 shot groups, followed by on or two 5 shot groups.

3) Start at 25 yrds
4) Move out to 100

* A standrard M16 can be zeroed dead on at 42 meters to hit dead on at 250 meters!

Taken From Combat Rifle marksmanship Excercises
By: Andy Stanford, Page 11

aplinker
05-01-2008, 12:49 PM
http://groups.msn.com/TheMarylandAR15ShootersSite/improvedbattlesightzero.msnw

50/200 for ANY optic that doesn't have BDC. If it has BDC, set it for what that optic is designed for.

GenLee
05-01-2008, 1:41 PM
UCLAplinker, Thank you for that link.

trinydex
05-01-2008, 1:52 PM
50 yd zero will give you a point blank of about 210 yds with M193.

http://www.loadammo.com/Topics/February02.htm

This means that where ever the dot is aimed on a target between 0 and 210 yds, the bullet point of impact will be no more than -2" or +2" above the point of aim/line of sight.

Knowing that, learn to eyeball ranges to your target and learn to use hold over/hold under to adjust your point of impact.

now, how to eyeball range targets.

Jicko
05-01-2008, 2:39 PM
now, how to eyeball range targets.

"The force".......

trinydex
05-01-2008, 2:48 PM
"The force".......

damn....

Jicko
05-01-2008, 2:58 PM
Thanks for the 50/200 comment, let me back it up with some NUMBERS.

[BTW, what's the SIGHT HEIGHT(offset from muzzle) is an EOTECH?!?!?! :confused:]

I assumed it is 50yds/200yds.

U.S. military specifications for M193 Ball ammunition require a 55
grain bullet (q 2 grains) at a muzzle velocity of 3,250 q 40 fps from a 20
inch test barrel measured 15 feet from the muzzle.

Assume sight height to be 2". Results by JBM.


Range Drop
(yds) (in)
0 -2
10 -1.5
20 -1.1
30 -0.7
40 -0.3
50 0
60 0.3
70 0.5
80 0.8
90 0.9
100 1.1
125 1.2
150 1.1
175 0.7
200 0
250 -2.5
300 -6.5
350 -12.2
400 -20


These numbers seems to be quite good with CQC and 3guns ranges. Basically, 0yds to 240yds, it would be -2" to +1.2", VERY NICE.

HEY, anyone know what the field guys are ACTUALLY doing? And urban units(police/swat)?

Thanks!

SuperSet
05-01-2008, 3:01 PM
Thanks for the 50/200 comment, let me back it up with some NUMBERS.
[BTW, what's the SIGHT HEIGHT(offset from muzzle) is an EOTECH?!?!?! :confused:]
I assumed it is 50yds/200yds.
Assume sight height to be 2". Results by JBM.

Range Drop
(yds) (in)
0 -2
10 -1.5
20 -1.1
30 -0.7
40 -0.3
50 0
60 0.3
70 0.5
80 0.8
90 0.9
100 1.1
125 1.2
150 1.1
175 0.7
200 0
250 -2.5
300 -6.5
350 -12.2
400 -20

These numbers seems to be quite good with CQC and 3guns ranges. Basically, 0yds to 240yds, it would be -2" to +1.2", VERY NICE.
HEY, anyone know what the field guys are ACTUALLY doing? And urban units(police/swat)?
Thanks!

Army BRM is still running 25y zero standard so basically, when you go to qualify, they'll tell you to shoot low. Someone seriously has to revise their rifle shooting program with the 50y IBZ.

Jicko
05-01-2008, 3:30 PM
If LOS is 2.5, the results look QUITE different.


Range Drop
(yds) (in)
0 -2.5
10 -1.9
20 -1.4
30 -0.9
40 -0.4
50 0
60 0.4
70 0.7
80 1.1
90 1.3
100 1.6
125 1.9
150 2.1
175 1.9
200 1.5
230 0.5
240 0
250 -0.5
280 -2.4
300 -4
350 -9.2
400 -20


So, effectively, 0yds to 280yds, +/- 2.5". Should be OK for CQC, man-sized target.

swhatb
05-02-2008, 9:27 PM
tagged... want to know this too :cool2:

Addax
05-02-2008, 11:04 PM
+1, 50 yds

I agree, go with 50. I believe 50 and 200 yards are the same POI with it slightly high at 100.

dwa
05-03-2008, 10:25 AM
im the army we always did 25m for m-4. longest target we would shoot at would be 300m. according to the army 25m is 300m it seemed to work fine. ive done it with a wide variety of optics with the same effect. but depending on your ammo and however your ar is built my info might not apply. i dont know the subtleties of the ar world. you can probably dl the army zero target i forget the nomenclature of it, its 2 sided 1 is m16 one is m-4 the difference is in the grid.

sergeantrex
05-03-2008, 2:36 PM
I'd go with 50 yards.

http://groups.msn.com/TheMarylandAR15ShootersSite/zeroingmethods.msnw

I zero mines at fity too. I make 100 yrd shots no problemo.