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m1ajunkie
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Posted: 5/6/2009 1:49:46 PM EST
Tomorrow I am headed to the range to re-sight in my iron sighted ar-15, and my aimpoint sighted scar. I have decided I am going to use the 50/200 yard zero on both, but my question is, does it really work as good as it sounds on paper? The reading I have found sounds like it is a very good idea, but I would like to from those who use this zero. How far off will my poi be at 100 yards?

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MillerSHO
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Posted: 5/6/2009 1:54:05 PM EST
At 100 yards?

About 1-2" high with a 50 yard zero.

It's not about faith, it's about physics.
Thankfully .223 is a pretty flat shooting round.



kjd2121
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Posted: 5/6/2009 1:57:07 PM EST
Can you guys explain the 50-200 sighting? Not sure I understand.
hickerx2
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Posted: 5/6/2009 2:02:10 PM EST
Originally Posted By kjd2121:
Can you guys explain the 50-200 sighting? Not sure I understand.


Zeroing @ 50yds will put your POI just an inch or two low @ 200.
IOW, you can kill whatever you want by holding dead-on out to 200yds.

m1ajunkie
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Posted: 5/6/2009 2:02:31 PM EST
[Last Edit: 5/6/2009 2:03:08 PM EST by m1ajunkie]
Originally Posted By kjd2121:
Can you guys explain the 50-200 sighting? Not sure I understand.


From what I've read you are able to zero at 50 yards and have your point of impact not be more than 2" off your point of aim out to about 240 yards or so. It's meant to be a battle zero, not for shooting x's all the time.
jblomenberg16
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Posted: 5/6/2009 2:04:42 PM EST
[Last Edit: 5/6/2009 2:05:34 PM EST by jblomenberg16]
Posted the same info that was just posted by others.
bob332
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Posted: 5/6/2009 2:05:17 PM EST

Originally Posted By kjd2121:
Can you guys explain the 50-200 sighting? Not sure I understand.

you sight in a 50yds and the bullet crosses ~ the same plane again at 200yds as it loses velocity and starts to fall
survivorman
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Posted: 5/6/2009 2:07:29 PM EST
I have my ARs set for 50yrds........like it alot. I figure they say most military engagements are at 100yrds or shorter.....god forbid I am ever in a SHTF scenerio I wont be engaging anything past 200yrds....I would rather go another way or let them go by. If I ever do need to defend myself or family it will more than likely be at 50yrds or closer.
AmericanPatriot
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Posted: 5/6/2009 2:12:28 PM EST
I assume you found the RIBZ link :

http://www.ar15.com/forums/topic.html?b=3&f=18&t=328143

I did it to all my irons, works great. Just remember if you have stock apertures and have altered the elevation drum you have to change it when flipping to the large aperture.
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m1ajunkie
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Posted: 5/6/2009 2:18:53 PM EST
[Last Edit: 5/6/2009 2:25:50 PM EST by m1ajunkie]
Originally Posted By AmericanPatriot:
I assume you found the RIBZ link :

http://www.ar15.com/forums/topic.html?b=3&f=18&t=328143

I did it to all my irons, works great. Just remember if you have stock apertures and have altered the elevation drum you have to change it when flipping to the large aperture.


No, I didn't see that. That looks interesting, and I may give that a try.

I'm a little confused, since I have a removable handle, do I still follow the procedure by having (6/3, -4 clicks) for the RIBZ 100 yard setting?
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Posted: 5/6/2009 2:30:53 PM EST
Originally Posted By bob332:

Originally Posted By kjd2121:
Can you guys explain the 50-200 sighting? Not sure I understand.

you sight in a 50yds and the bullet crosses ~ the same plane again at 200yds as it loses velocity and starts to fall


Thats how I always understood it, and my 200 yrd zero on my 3 gun rifle does well at 50 yard stuff too.

Is it "clover leaf" accurate at both distances, not quite but good enough to stop paper USPSA targets.
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OrangeLazarus
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Posted: 5/6/2009 2:37:48 PM EST
Originally Posted By m1ajunkie:
Originally Posted By kjd2121:
Can you guys explain the 50-200 sighting? Not sure I understand.


From what I've read you are able to zero at 50 yards and have your point of impact not be more than 2" off your point of aim out to about 240 yards or so. It's meant to be a battle zero, not for shooting x's all the time.


The maximum point blank range of a 55 grain .223 round is about 230 yards as I recall. Meaning it will not rise or drop more than 3" getting to 230 yards when zeroed at 50 yards. Pretty flat shooting round.
sgtmike
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Posted: 5/6/2009 2:48:12 PM EST
I've had my carbine zeroed at 50 yards for several years and think for a battle/combat/patrol rifle zero it is the way to go. I have an aimpoint Comp M with a 4moa dot. I know that from 50 to 225 yards the bullet will hit where my dot is. I'm quite comfortable with it and have not had any problems qualifying with my carbine each year. I have also got several other officers using it as well.

Sarge
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Posted: 5/6/2009 2:57:53 PM EST
[Last Edit: 5/6/2009 2:58:49 PM EST by Observer]
I use 50yd zero exclusively on my rifles, mainly because it works great and doesnt require much in the way of thinking to keep shots in the neutralize zone on targets.

For practical shooting I think it's the best choice, since a 2" difference will get you on the steel at anything from 25yds to 200yds and unlike a 25m zero you don't have to compensate downward for that 4" elevation change at the 100yd mark.

You do have to be aware that it will be shooting low in very close ranges (0-10yds) and plan for that if you are going for single shot 'A' zone hits or partially obscured targets. Luckily at the close ranges you can see the holes and verify where you're hitting. Other than that just put the punkin on the post and you're good to go.

The main thing is to get a consistent zero. You can start sandbagged at 25yds and get a very tight, consistent group exactly 2" under the bullseye, then move it out to 50 yds and verify it's right on. May require minor adjustment.


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TerryC
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Posted: 5/6/2009 3:02:42 PM EST
I've reset my A2 sights on my Bushy carbine to RIBZ. I keep it set one click up from 25-300 (for potential HD use) but rotate it down to 50-200 when shooting outdoors.

My old eyes suck! I have a hard enough time focusing on targets out beyond 200 yards with iron sights, nevermind precision target work.

But I can still shoot "minute of ribcage" and that should be good enough!

At 100 yards I do much better with irons, just the facts of life I guess.
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MikefromTX
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Posted: 5/6/2009 3:27:35 PM EST
Originally Posted By kjd2121:
Can you guys explain the 50-200 sighting? Not sure I understand.


Look at this ballistics chart and you'll see what they are talking about:



.
.
reelserious
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Posted: 5/6/2009 3:44:59 PM EST
[Last Edit: 5/7/2009 4:38:37 AM EST by reelserious]
Originally Posted By m1ajunkie:
Originally Posted By kjd2121:
Can you guys explain the 50-200 sighting? Not sure I understand.


From what I've read you are able to zero at 50 yards and have your point of impact not be more than 2" off your point of aim out to about 240 yards or so. It's meant to be a battle zero, not for shooting x's all the time.




1+ also will be a inch or so low at 25 yards edit
MillerSHO
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Posted: 5/6/2009 3:46:19 PM EST
Originally Posted By reelserious:
Originally Posted By m1ajunkie:
Originally Posted By kjd2121:
Can you guys explain the 50-200 sighting? Not sure I understand.


From what I've read you are able to zero at 50 yards and have your point of impact not be more than 2" off your point of aim out to about 240 yards or so. It's meant to be a battle zero, not for shooting x's all the time.




1+ also will be a inch or so high at 25 yards


I think you mean low.

survivorman
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Posted: 5/6/2009 4:23:56 PM EST
wrong will be an inch or so low.....
Blackburn01
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Posted: 5/6/2009 4:25:22 PM EST
I'm wondering how much barrel length would matter in this equation, say 16" vs. 20" ?
wgjhsafT
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Posted: 5/6/2009 4:39:03 PM EST

Originally Posted By Blackburn01:
I'm wondering how much barrel length would matter in this equation, say 16" vs. 20" ?
This gives you an idea:



None at this time...
nevermiss
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Posted: 5/6/2009 4:46:27 PM EST
[Last Edit: 5/6/2009 4:47:28 PM EST by nevermiss]
Look at this ballistics calculator

I recently competed in a 3 gun competition with shots to 400 yards. My local range is only 100 yards.

Even if you don't have a chronograph, you can probably find rough velocity of factory ammo from a similar length barrel as your rifle as well as the BC of your bullet (such as the post above mine).

This is good stuff right here. It also takes into account your sight height compared to the bore. Best of all, "It's FREE".

I actually printed out my chart and took it with me to the match. I was able to hit all of my long range steel.

Thanks to the member who posted this about a month or two ago!
Blackburn01
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Posted: 5/6/2009 4:49:43 PM EST
thanks
bob332
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Posted: 5/6/2009 4:50:14 PM EST

Originally Posted By nevermiss:
Look at this ballistics calculator

I recently competed in a 3 gun competition with shots to 400 yards. My local range is only 100 yards.

Even if you don't have a chronograph, you can probably find rough velocity of factory ammo from a similar length barrel as your rifle as well as the BC of your bullet (such as the post above mine).

This is good stuff right here. It also takes into account your sight height compared to the bore. Best of all, "It's FREE".

I actually printed out my chart and took it with me to the match. I was able to hit all of my long range steel.

Thanks to the member who posted this about a month or two ago!

or if you have a windows mobile powers device - cell phone, pda, etc take a look http://www.ar15.com/forums/topic.html?b=1&f=5&t=848823&page=1

FiftyCalAl
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Posted: 5/6/2009 5:03:01 PM EST
excellent information
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Tony44
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Posted: 5/6/2009 5:12:20 PM EST
So if I do 50yd zero I'll be:

1-2" hi at 100yds
&
1-2" low at 200yds?
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