Zeroing on a 25 yard indoor range.

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[ARCHIVED THREAD] - Zeroing on a 25 yard indoor range.

Posted: 12/14/2005 10:51:44 PM EDT

Hey guys.
I know that to really be dialed in at 200 yards, I need to go out and shoot at 200 yards. But it will be a little while before I can take my 16" Stag M4gery out in the boonies and set up a target.
In the mean time, I have access to a 25yard indoor range. My question to you is if I am shooting a 50grn HPFB at a stated muzzel velocity of 3400 FPS, where should I be grouping relative to the point of aim at 25 yards to be dead on at 200 yards? Above, below, one inch or two?

I am sorry if this isn't enough info, and I am sounding like too much of a NU BEE.

Any suggestions would be great.

Gunner45

Posted: 12/14/2005 11:19:04 PM EDT

[#1]

set your rifle a 2'' high at 25 yards and that should be with in 1" at a 100 yards.

Posted: 12/15/2005 5:17:01 AM EDT

[#2]

Quoted:
set your rifle a 2'' high at 25 yards and that should be with in 1" at a 100 yards.

NOPE!!!!!!!!!

This is how you zero!
We used to "Rangr fire" twice a year when I was in the guard..(19yrs)
You want a 3 shot group all in the size of a dime at 25yds.That means at 250yds your bullet will land at the same place on the target!
Do this in a supported posion at a bench... It will make it alot easer to zero.
Good luck! I used to HATE range fire........All day at the range with pin-heads! who could'nt shoot

Posted: 12/15/2005 8:37:39 AM EDT

[#3]

Gunner are you sure your not talking about 25 Meters? My understanding is 3/8 inch low at 25 yards.

Posted: 12/15/2005 8:40:35 AM EDT

[#4]

groups.msn.com/TheMarylandAR15ShootersSite/25yardzeroingmethod.msnw

Posted: 12/15/2005 8:53:15 AM EDT

[#5]

Quoted:
set your rifle a 2'' high at 25 yards and that should be with in 1" at a 100 yards.

?? What planet are you shooting on? Jupiter?

Zeroing DIRECTLY at 25 yards will produce a zero that is 6" HIGH at 100y, at 2" high at 25 y that bullet will be over a foot HIGH at 100y.

If you want to zero at 25y to get a 200M zero then the bullet should be striking between 1" and 1.25" BELOW the point of aim.

Posted: 12/15/2005 9:35:41 AM EDT

[#6]

Quoted:
Gunner are you sure your not talking about 25 Meters? My understanding is 3/8 inch low at 25 yards.

Yea, it's olny a 25 yard indoor range. Really a 24.9 yard range according to my brothers laszer range finder.

"If you want to zero at 25y to get a 200M zero then the bullet should be striking between 1" and 1.25" BELOW the point of aim"

Thanks guys, this is just what I was looking for.

Gunner45

Posted: 12/15/2005 9:40:05 AM EDT

[#7]

Quoted:
[You want a 3 shot group all in the size of a dime at 25yds.That means at 250yds your bullet will land at the same place on the target!

You sure you shot qualification in the Guard?

I've never seen a 25y range in the military - they were all 25M.

Secondly when zeroing at 25M we used the 'L' aperture, before going over to the firing line we switched to the unmarked apeture to get the 43/250M battlesight zero. If we had not flipped the aperture we would have had a 25/375M zero on our M16A1s

I wasn't in the Guard for 19years, but in my 7 years I did manage to make expert every time.

Posted: 12/15/2005 9:49:12 AM EDT

[#8]

Quoted:
Hey guys.
I know that to really be dialed in at 200 yards, I need to go out and shoot at 200 yards. But it will be a little while before I can take my 16" Stag M4gery out in the boonies and set up a target.
In the mean time, I have access to a 25yard indoor range. My question to you is if I am shooting a 50grn HPFB at a stated muzzel velocity of 3400 FPS, where should I be grouping relative to the point of aim at 25 yards to be dead on at 200 yards? Above, below, one inch or two?

I am sorry if this isn't enough info, and I am sounding like too much of a NU BEE.

Any suggestions would be great.

Gunner45

If you want a better projection, measure the actual muzzle velocity out of your rifle. Then use one of the many online ballistic calculators to select a 200 yd zero. Then use the table from the calculator to see where you should be hitting at 25 yds.

ETA: your sight height should be 2.6" for an AR.

Posted: 12/15/2005 10:03:15 AM EDT

[#9]

i think if you point the rifle up at about 85 degrees and fire you should be right on at 200cm i mean...

Posted: 12/15/2005 10:23:50 AM EDT

[#10]

Simple answer, you should not ZERO your rifle at 25 yards unless that's the range you'll be shooting at. If you want to shoot with a 200yd zero, you should zero it about 1" low at 25 yards then shoot a group at 200 yards to verify and fine-tune the zero.

If you've got A2 sights on your gun, follow the Maryland AR-15 board advice on zeroing at short range.

Posted: 12/15/2005 3:09:02 PM EDT

[#11]

Quoted:
Quoted:
[You want a 3 shot group all in the size of a dime at 25yds.That means at 250yds your bullet will land at the same place on the target!

You sure you shot qualification in the Guard?

I've never seen a 25y range in the military - they were all 25M.

Secondly when zeroing at 25M we used the 'L' aperture, before going over to the firing line we switched to the unmarked apeture to get the 43/250M battlesight zero. If we had not flipped the aperture we would have had a 25/375M zero on our M16A1s

I wasn't in the Guard for 19years, but in my 7 years I did manage to make expert every time.

Your wright........ I stand corrected!
25M to zero

I used to really hate range fire...........All day

Posted: 12/15/2005 3:28:11 PM EDT

[#12]

I kinda think the original Q, was to be on paper at 200 where should he zero at 25 ..... THEN when he gets a chance to go out and shoot at 200 he will be relitively close.
I would like to know the same thing.
Jim

Posted: 12/15/2005 4:19:55 PM EDT

[#13]

Quoted:

If you want to zero at 25y to get a 200M zero then the bullet should be striking between 1" and 1.25" BELOW the point of aim.

Ding ding ding, we have a winner

Give a range report later.

Posted: 12/15/2005 7:30:03 PM EDT

[#14]

Quoted:
I kinda think the original Q, was to be on paper at 200 where should he zero at 25 ..... THEN when he gets a chance to go out and shoot at 200 he will be relitively close.
I would like to know the same thing.
Jim

Jim I answered this earlier in the thread.

Posted: 12/16/2005 12:16:40 PM EDT

[#15]

The military never uses yards, meters and clicks are used to just trying confuse us kentucky windage guys.

Posted: 12/17/2005 6:31:57 PM EDT

[#16]

fizassist

Thanks for the link to that online calculator. Very handy

Gunner45

Posted: 12/17/2005 6:40:10 PM EDT

[#17]

Quoted:
set your rifle a 2'' high at 25 yards and that should be with in 1" at a 100 yards.

That sounds a bit too high to me. The sights of an AR are already about 1.5" above the bore, if you shoot 2" high at 25, you might end up way too high at 100. That's just a guess though, lots of others here with hard data to back it up. I bought some Bushmaster zeroing targets and they have a prescribed procedure to 25 yard zeroing. Wish I was at home so I could quote it.

groups.msn.com/TheMarylandAR15ShootersSite/25yardzeroingmethod.msnw

Posted: 12/17/2005 6:50:57 PM EDT

[#18]

Go with Chuck's IBZ method, you won't regret it.

IBZ Zero Method

Posted: 12/18/2005 12:45:10 PM EDT

[#19]

TAG

Posted: 12/18/2005 2:38:11 PM EDT

[#20]

Quoted:
Go with Chuck's IBZ method, you won't regret it.

IBZ Zero Method

+1 on Chuck Santose's method.
If you are not using it you are missing something important in your bag of AR tricks.

Posted: 12/21/2005 11:29:33 AM EDT

[#21]

http://www.biggameinfo.com/

This is one of the easiest online ballistic calculators I have found.

At 25 yrs with 2.6 inch high sights 1 to 1.25 inches puts you to a 200 yrd/ 250yrd zero.

Posted: 12/21/2005 12:42:12 PM EDT

[#22]

Thank you thread! Now I will re-zero properly.

[ARCHIVED THREAD] - Zeroing on a 25 yard indoor range.

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