Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login
Posted: 12/14/2005 10:51:44 PM EDT
[Last Edit: 12/14/2005 10:53:21 PM EDT by Gunner45]
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
Link Posted: 12/14/2005 11:19:04 PM EDT
set your rifle a 2'' high at 25 yards and that should be with in 1" at a 100 yards.
Link Posted: 12/15/2005 5:17:01 AM EDT

Originally Posted By okguy91:
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
Link Posted: 12/15/2005 8:37:39 AM EDT
Gunner are you sure your not talking about 25 Meters? My understanding is 3/8 inch low at 25 yards.
Link Posted: 12/15/2005 8:40:35 AM EDT
Link Posted: 12/15/2005 8:53:15 AM EDT

Originally Posted By okguy91:
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.
Link Posted: 12/15/2005 9:35:41 AM EDT

Originally Posted By DonD:
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
Link Posted: 12/15/2005 9:40:05 AM EDT

Originally Posted By PDshooter:
[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.
Link Posted: 12/15/2005 9:49:12 AM EDT
[Last Edit: 12/15/2005 9:50:44 AM EDT by fizassist]

Originally Posted By Gunner45:
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.
Link Posted: 12/15/2005 10:03:15 AM EDT
i think if you point the rifle up at about 85 degrees and fire you should be right on at 200cm i mean...
Link Posted: 12/15/2005 10:23:50 AM EDT
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.
Link Posted: 12/15/2005 3:09:02 PM EDT

Originally Posted By Forest:

Originally Posted By PDshooter:
[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
Link Posted: 12/15/2005 3:28:11 PM EDT
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
Link Posted: 12/15/2005 4:19:55 PM EDT

Originally Posted By Forest:


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

Originally Posted By rideage:
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.
Link Posted: 12/16/2005 12:16:40 PM EDT
[Last Edit: 12/16/2005 12:20:53 PM EDT by DonD]
The military never uses yards, meters and clicks are used to just trying confuse us kentucky windage guys.
Link Posted: 12/17/2005 6:31:57 PM EDT
fizassist

Thanks for the link to that online calculator. Very handy

Gunner45
Link Posted: 12/17/2005 6:40:10 PM EDT
[Last Edit: 12/17/2005 6:41:49 PM EDT by txgp17]

Originally Posted By okguy91:
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
Link Posted: 12/17/2005 6:50:57 PM EDT
Go with Chuck's IBZ method, you won't regret it.

IBZ Zero Method
Link Posted: 12/18/2005 12:45:10 PM EDT
TAG
Link Posted: 12/18/2005 2:38:11 PM EDT

Originally Posted By Sader762:
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.
Link Posted: 12/21/2005 11:29:33 AM EDT
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.
Link Posted: 12/21/2005 12:42:12 PM EDT
Thank you thread! Now I will re-zero properly.
Top Top