ar15 zero.

[goodnightChesty1775]

so im used to the 25m zero that the army uses for the 14.5" m4 barrel yadda yadda yadda..

but i dont too much dig the slight hold overs i would use with the acog out to 300... i know you dont NEED to hold over out to 300 but i did anyway and shot 40s almost constantly... but enough with that.

saw a video Travis Haley did about zero's out too 300m, and the marine method i guess is a 36m BZO that puts you on the 300m zero, i have never tried this method but, it produces a 5'' combat effective zone out to 300m... thats pretty freaking sweet compared to the 24" zone the 25m zero gives you.

couldnt get the damn link to work... AR15 Zeroing At Distance is the video

PS  and im back, again, going to try to stick around this time. got out of the army in april now living in vermont, just got my ar and took that pesky bullet button off.

PPS after typing all this out and thinking about it more, im going to stick with the 25m zero as i know it and am very used to it. but still a good topic to think about.

[APX808]

Nice to see you back man.

Something happened with youtube that isn't letting me embeed the video, it says something about the device support... I'll take a look at the problem

[JohnyMac]

GNC17715, welcome home!  When you are up to it fill us in on your Army experience and why you are now a civilian - No rush.

I do not use a dead on at 25 yard (25 meters) hold. My sights are set for 1" POI under at 25 yards. This gives me dead on between 50 -150 yards, ~3" under at 200 yards and ~11" under at 300 yards.

Not right not wrong just what i do.

Again welcome back bro 

PS: You have exceeded 500 posts so you are entitled to a Unchainedprepper morale patch. PM me where to send it to 

[Kbop]

www.youtube.com/watch?v=g9oXGT55cV8

see if this works - linked as apposed to embedded.

Mr. Moderator - there is a minor glitch in the hyperlink function when you save it.

[Reaver]

do it just like the army.

The sized 300 meter target plastered on a 25m target at 25 meters.
The only time you have to worry about missing is at 225-275 and that's do to bullet trajectory overshooting just aim at the belly button.

If you have an ACOG depending on the model each tick mark should register 100 meters past 300 meters for your hold over. If you're doing room clearing don't use your ACOG point shoot using the bore. Or get one of those highspeed double redot acogs.

If that makes sense I hope I helped.


Wait holy shit, it's chesty. Ha! Welcome home brother glad to see you.

Bro, what the fuck what you do like 2 years and get out or something?

[CJS06]

One of the most effective zeros for the AR15 platform in its multiple barrel lengths from 10.5" to 18" variations is the 50yd.  This will give you a very strong BZO out to 400 yds.  Here are some POA/POI #s (vary slightly depending on the barrel length and ammo).

This is for Irons and RDS sights (Aimpoint/EOtech/etc.)

0-25 yds 2" low (height over bore)
50 yds  zero
100 yds approx 1-1.5" high
200yds zero
300 yds 2-3" low  (hold on neck for center mass hits)
400 yds 8" low   (will still hit abdomen when holding on center)
500 yds 12-13" low    (will still hit pelvic girdle when holding on center)

It gives the easiest quick combat effective hits and allows for very quick corrections.

BTW, I use yds because in the US very few people actually think in meters. Most have grown up in using feet/yds and actually mis estimate meters short as a result.

Magnified optic are a totally different animal. You need to zero based upon the manufacturers spec. For instance to get the BDC to work for my Leupold MK6 1-6x CMR you need to zero at 50, however for my Elcan Specter 1-4x  BDC to work the zero needs to be 100. Both work great out to 500yds and are just about spot on based on ammo (most require 5.56 and will be slightly off if you shoot weaker .223). Most optics that use mil/mil or moa reticles will require a 100yd zero if you want then to work effectively for ranging or repeatable dope.

I hope this is helpful.  The 50 works great for me and is the most commonly used by guys I shoot with. You need to use what works best for you.

If you want to try this quickly check out Frank Proctor. He has an technique for getting a quick 50yd zero at 10yds that is remarkable reliable. Just remember to always verify your zero.

Chris

[JohnyMac]

Hey Chris, how was WY?Do any long range plinking?

[CJS06]

Just got back yesterday. Been out there since the 19th.  What a great class.  We shot everything from 50yds to a longest of 780 using a combination of reticle holds and turret adjustments.  Weather varied from 34 degrees and snow to 78 degrees and bright sun.....with a lot of 45-55 deg rain in between.  We shot a little flat range but spent most of the week out in the terrain shooting into both lower and higher elevation with our base elevation at 7200 ft.  We spent a significant amount of time working on ranging using mil reticle and constantly developing our own dope.  Our lowest round count day was approx 350 rds (with a total of about 2200-2300 rds).  Other than one or two guys shooting .308 everyone ran 5.56.  My team mate Josh ran a 12.5"SCAR 17 with a Leupold MK4 3.5-10x and 155gr BTHP.  I shot my 14.5" Warsport GPR-E with a Vortex Viper 2.5-10x and 77gr SMK.  I was able to shoot with a bunch a good guys that I was really able to learn a bunch from.

[CJS06]

GNC1775
To get back to your post about zeros. 

Normally with magnified glass like we ran at our class we start with a 100yd zero.  Interestingly we found that when running shorter barrels (my friends 12.5" and my 14.5") we got great results zeroing a "loose 50 yd" zero. We did this by zeroing about 3/4" low at 100yds. This helped make up for the slight velocity loss associated with shorter carbines when out at distance. This held true with both 5.56 and .308. It worked very well and our team was able to win all but two of the competitions that we ran throughout the week.  One shooter ran the entire class with a KAC SR15 sporting and Aimpoint t-1. He truly understood his rifle and his holds. Out to 400 yds he was super competitive (read accurate and fast) and was still able to get good hits out to 550-600yds.  He obviously couldnt range but once he was supplied with distance he understood his holds and hammered the targets. He was zeroed at 50yds.

Chris

[Kbop]

Sounds like a cool time!
Thanks for the info.