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11/20/2019 5:07:11 PM
Posted: 10/24/2006 8:09:39 AM EST
I'm currently in Iraq. Currently we zero our weapons at 25 meters. Who can point me to a ballistic table or program so that I can justify using a 50 yard zero?

I want to show them what the two different trajectories look like with the same weapon and ammo.

The weapon is an M4 carbine and the ammo is 62 gr green tip. The optic is a Compact ACOG 2x mounted on the carry handle.
Link Posted: 10/24/2006 8:45:42 AM EST
The primary reason for zeroing at 50 is to be within an inch or two from 50 to roughly 200 yrds. It requires modifications to carry handles and A2 sights to have the correct comeups at extended ranges. Is there a reason the 300m zero isn't working for you?
Link Posted: 10/24/2006 9:13:32 AM EST
Using an ACOG, you should keep with the accepted zeroing practice. But, part of that process is to Verify zero at the 100 yard line (and out to 300 if possible).

25 yards is a Battle Sight Zero. Which means, pretty close.

That said. I have zeroed at 1" high at 50 yards with an ACOG. This gives you a +- 3" point of impact out to 300 yards, using the main wire, and no hold off.

Link Posted: 10/24/2006 9:14:45 AM EST
Link Posted: 10/24/2006 9:16:34 AM EST
Ooops... forgot.

Try Point Blank software (free). It will get you in the ballpark.

Link Posted: 10/24/2006 9:23:09 AM EST
[Last Edit: 10/24/2006 9:29:10 AM EST by Forest]
Link Posted: 10/24/2006 9:53:28 AM EST

Originally Posted By Forest:

Send me an e-mail and I can supply you with the drop tables and hi-res versions.

BTW if you have a Compact ACOG on top of the carry handle you change the equation a bit.

Zeroing as indicated) will raise the trajectories throughout the range. The 50y zero will still be usable, but the 25M zero get's really shitty in the mid range (say 150-250y). With Compact ACOGS on the carry handle 75yards is a better option for zeroing (it comes closer to replicating the 50y trajectory using sights that are 2.6" over the bore (like irons and Aimpoints).


This is exactly what I'm looking for.
E-mail sent with my e-mail addy.
Link Posted: 10/24/2006 11:07:08 AM EST
As an Army guy who has qualified a few times and used the Army 25 meter zero method, my question is:

Can I use the 25 yard zero method with other types/weights of .223 in the AR 15 Carbine???

Thanks in advance.

Link Posted: 10/24/2006 11:16:40 AM EST

Originally Posted By army_eod:
As an Army guy who has qualified a few times and used the Army 25 meter zero method, my question is:

Can I use the 25 yard zero method with other types/weights of .223 in the AR 15 Carbine???

Thanks in advance.

It depends. Technically, no, trajectories will not be exactly the same. Practically, yes, the differences in trajectory between 55 to 75 grain ammo out to 300 meters is still minute of man close.
Link Posted: 10/24/2006 11:22:38 AM EST
Link Posted: 10/24/2006 11:24:53 AM EST
Guys...I like them answers. Thx.

Then I would verify at 100 yards.
Link Posted: 10/24/2006 11:59:05 AM EST

How did you figure the sight over bore for the Compact ACOG on a carry handle? Is there some sort of table somewhere that list the optics and mount combos?

I'd like to figure out the trajectory for xm193 out of my 14.5" with EOTech on RRA Dominator back home.
Link Posted: 10/24/2006 12:10:20 PM EST
Link Posted: 10/24/2006 12:34:36 PM EST
Link Posted: 10/24/2006 12:50:50 PM EST
Link Posted: 10/24/2006 1:03:49 PM EST
I know bigbore personally, so I always value his advice. The problem with demonstrating this is our range only goes to 100 yards. Don't laugh, the first time I was here, most ranges were only 25 meters. Okay for pistol and close rifle work, but not good for anything else.
Link Posted: 10/24/2006 1:18:28 PM EST
Link Posted: 10/28/2006 3:18:08 PM EST
Zero at 42 meters will give you a FLAT 250 meters. Works great for me.
Link Posted: 10/28/2006 6:57:18 PM EST
I zero at 25 meters with a Leupold 2.5-8 mildot and I hit within an inch of the eyeball on a Jane Fonda head target with M-193, M855, and HST 77 grain hpbt. Three distinct shot groups. If I want to make an eyeball shot I use the HST but the others get me to the head just fine.
Link Posted: 11/1/2006 1:51:30 PM EST
Bigbore have fun at super dave

one of my buddies will be there at it il lbe deep in the wood hunting and filming for the tv show.....

his name is MAtt
Link Posted: 11/2/2006 4:38:48 AM EST
Link Posted: 11/2/2006 9:18:27 AM EST
I know I can nail Tin Cans at the BERM 220 yards or so useing a M4 and ML2 and 551

At this zero M855 seems the same as 77grBH blue box
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