50 yard zero right? > AR Discussions

Posted: 5/12/2008 11:10:51 AM EDT

Greetings.
I've read through previous post and it seems alot of people disagree on the best range to zero. Iv'e seen 25 yards, but I did a little trajectory checking and it seems 50 would be better. Is 50 a good zero for close range?
Thank you for your time and advice!
Take care

Posted: 5/12/2008 11:12:21 AM EDT

[#1]

yes, 50y is best.

Posted: 5/12/2008 11:15:17 AM EDT

[#2]

Thank you!

Posted: 5/12/2008 11:26:14 AM EDT

[#3]

Posted: 5/18/2008 7:56:42 PM EDT

[#4]

So if I zero at 25 yards I'll be about 7" high at 100 yards?

Posted: 5/18/2008 7:59:47 PM EDT

[#5]

Quoted:
So if I zero at 25 yards I'll be about 7" high at 100 yards?

Actual results will vary depending on specific barrel length and muzzle velocity, but that chart gives an example of why a 50 yard zero is generally a good idea.

Posted: 5/18/2008 8:02:43 PM EDT

[#6]

just over 6in high... and that chart will vary based on bullet weight barrel length... phase of the moon day of the week ect... but its a good starting point

Posted: 5/18/2008 11:34:27 PM EDT

[#7]

This sounds like a silly question to me, but where do you measure from? That is, from the muzzle of the rifle, or where?

Posted: 5/19/2008 2:42:54 AM EDT

[#8]

Ever since Chuck Told me about the 50yard Zero
Ive been useing it

works great at a RANGE

Posted: 5/19/2008 4:53:33 AM EDT

[#9]

Funny how when I zeroed my issue M16A2 at 25 meters, the point of impact was within an 1 1/2" at 250 meters yet this chart shows an almost 9" difference in POI. This is with 62gr FMJ issue ammo.

I had similar results when I was using an M16A1 with 55gr FMJ.

Posted: 5/19/2008 5:05:44 PM EDT

[#10]

i was lookin at the chart and some reason... i think i was told a 25 meter zero will be on at 300... i know the charts in yds but does the 25 yd trajectory drop that bad to be on at 300 or am i under-informed?

Posted: 5/19/2008 5:11:32 PM EDT

[#11]

IIRC, when zeroing on the 25m target your elevation wheel went either up or down a click or two before zeroing and back to 8/3 for a 300m zero

50/200 works best for me and I think I read an article in GD about the Army considering changing to 50/200 a week or two ago

Posted: 5/19/2008 5:18:47 PM EDT

[#12]

if I remember correctly. we used 25 yard zero but it was a 50 yard target and you made an adjustment on the elevation knob of the rear sight.

I could be wrong. It was a long time ago and I have been wrong before.

Posted: 5/19/2008 5:26:41 PM EDT

[#13]

90% or more of gun fights take place well under 50 yds..thats been true for a long,long time..50yds will do and under 100 yds for a carbine is when 5.56 will be most effective.If I have to shoot longer ill go .308 with my M14.

Posted: 5/19/2008 5:43:13 PM EDT

[#14]

Quoted:
i was lookin at the chart and some reason... i think i was told a 25 meter zero will be on at 300... i know the charts in yds but does the 25 yd trajectory drop that bad to be on at 300 or am i under-informed?

You were told wrong. An M16A2/AR-15A2 firing M855 that has a first crossing zero of 25 meters (27.3 yards) will have a second crossing zero of approximately 350 meters ( approximately 382 yards).

Posted: 5/19/2008 6:35:05 PM EDT

[#15]

Quoted:
Funny how when I zeroed my issue M16A2 at 25 meters, the point of impact was within an 1 1/2" at 250 meters yet this chart shows an almost 9" difference in POI. This is with 62gr FMJ issue ammo.

I had similar results when I was using an M16A1 with 55gr FMJ.

I know for a fact the M16A1s that were zeroed at 25M were useing the L aperture, then the soldier would switch to the unmarked aperture for the 250M battlesight zero.

Similarly when M16A2s are zeroed at 25M they adjust the elevation during the zeroing process then are dropped back down to shoot.

Posted: 5/19/2008 6:38:35 PM EDT

[#16]

Quoted:
This sounds like a silly question to me, but where do you measure from? That is, from the muzzle of the rifle, or where?

The reference line is the LINE OF SIGHT (LOS, or just 'sightline'), the only constant in the trajectory game. Think of it this way; when you look at the target, there is a straight line from your eye to the target. With a sighted-in gun at the appropriate range, with the sights lined up on the LOS, you hit the target. Once you pick the trajectory you want to use, you can sight in at any range - just pick the distance of the trajectory under or over the LOS at the range you want to use, sight at the center of the target and adjust the sights to place the round on-center and at the correct vertical location. You then can predict where the bullet will be at any range. So, if you have a 25/300M trajectory set, you know you will be 6" high at 100M, which works out great if that's the range you're shooting that day. You sight at the center of the 100M target and verify that you're on-center and 6"high.

Posted: 5/19/2008 6:48:53 PM EDT

[#17]

Quoted:
i was lookin at the chart and some reason... i think i was told a 25 meter zero will be on at 300... i know the charts in yds but does the 25 yd trajectory drop that bad to be on at 300 or am i under-informed?

That's why the lowest range on the rear sight is '300'. It doesn't mean the bullet will cross the line of sight exactly at 300M, it means you could hit somewhere in the center mass of an enemy. The design of the sights and the sighting procedure are all set up for the 25/300 'zero'. To get the 50M/200M zero the rear sight has to be set a different way. The front sight post may not be tall enough on some weapons, but a taller post is available. Look up 'IBZ' to find out more.

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