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Posted: 9/25/2005 4:57:20 PM EDT
[#1]
all the instructors so far has taught 50yds i.b.z., at 25yds you should be shooting approx 1.5" low from p.o.a. at 50 yds p.o.a=p.o.i.
at 100yds 2-3" high, 200yds p.o.a=p.o.i. m193/m855. there is a good graph showing bullet trajectory. hope someone can post it. i'm not that computer savy. just learned this stuff recently myself.... take a class and you'll understand. hope this helps. meat |
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Posted: 9/25/2005 5:56:42 PM EDT
[#2]
ya ive read that but i dont have access to a 50yrd range that easily"hour drive"
i want a guick and dirty zero now then next time i will do the 50 when i get to larger range my club only has a 35 yrd range "unless i cheat if no one is around  "
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Posted: 9/25/2005 11:50:21 PM EDT
[#3]
wo w i really f'ed that up
edit |
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Posted: 9/26/2005 12:10:57 AM EDT
[#4]
 not a good zero for middle distances inside of roughly 15 yards you'll be ~2.5" low regardless of zero  if you use the A2 sights as designed then the +4-5 in the mids is closer to 0,0 |
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Posted: 9/26/2005 6:02:33 AM EDT
[#5]
The newest Marine zero is at Edited to correct range |
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Posted: 9/26/2005 9:09:20 AM EDT
[#6]
coll do i do the same steps just at 36 yrds?
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Posted: 9/26/2005 11:14:14 AM EDT
[#7]
Let me correct my above post:
From groups.msn.com/TheMarylandAR15ShootersSite/zeroingmethods.msnw
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Posted: 9/26/2005 4:52:02 PM EDT
[#8]
as I understand it the USMC zero isn't really done at 8/3 but instead two clicks above the bottom most position of the RSB (which when set to USMC standards is 8/3).
ar15.com/forums/topic.html?b=3&f=18&t=250535
this one is POA/POI at 36yds 
as that distance is greater than the sight's HOB the round will never cross, or coincide with, the LOS. -1.5" at 25 will approximate a 100 yard zero |
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Posted: 9/26/2005 5:14:56 PM EDT
[#9]
50/200 is probably the best method out there. 1.5" low at 25m.
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Posted: 9/27/2005 1:50:36 AM EDT
[#10]
I just attended a patrol rifle instructor class and we were taught a 25 yard zero. We also used the small apature which I don't understand using for close distances like we will be using it for.
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Posted: 9/27/2005 8:42:44 AM EDT
[#11]
if i understand this right you are supposed to switch back to the large appature after zeroing
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Posted: 9/27/2005 10:55:53 AM EDT
[#12]
with the ibz, is the range wheel functional? Or are they assuming that all engagements will take place within 200? I recently zereod my 16 lmt at 50 (6/3-4) and was wondering if I put it to 6/3, would it be spot on at 300...
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Posted: 9/27/2005 1:45:19 PM EDT
[#13]
If you follow the IBSZ the range wheel will be properly calibrated. of course if you READ the IBSZ instructions you'd know that... |
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Posted: 9/27/2005 3:19:48 PM EDT
[#14]
you're all over the road brother. the switching between aps thing is for the M16A1 Army zero, zero at 25 m on the L ap then flip back to the unmarked ap for a 250 m zero. Army A2s are zeroed on the small ap at 25 m with the el wheel set to 8/3+1 then rotated down one click to 8/3 for a poor 300 m zero. flipping to the O-2 ap drops the traj 4-6MOA. zeroing with the small ap at 25 then flipping to the 0-2 will approximate a 300 m zero and undoing the point of the 25 m zero used by a lot of agencies. If 25 yards if your max expected range of engagement then zero for that range is often taught. |
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Posted: 9/27/2005 5:45:23 PM EDT
[#15]
ok now iam really confused...
if ya do the zero buy the small apature......... do you do all your shooting buy it also what happens to the large apature? do ya not use it at all? |
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Posted: 9/27/2005 6:45:03 PM EDT
[#16]
The large aperture is definitely used - for ranges of 0-200. Doing the switch as mentioned above is for your zero process.
If you paste the address below into your browser it will take you to bushmasters manual...sight in procedure is on page 33. HTH. http://www.bushmaster.com/faqnew/content_by_cat.asp?contentid=165&catid=99 |
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Posted: 9/27/2005 6:46:20 PM EDT
[#17]
let's say we're talking A2 sights with the theoretical Army zero.
zeroed at 300, lil low at 25. when you flip the sight to the 0-2 ap (0-200 metres) the trajectory drops 4-6MOA (depending on make of ap) bringing the POI into better coincidence at the nearer ranges. You can se by the chart that if you drop the 225 POI (+4") by 4MOA you'll be about 5" LOW-at that range with 1MOA being 2.25" at 225 so -4 MOA would be -9" minus the +4" already present. Additionally if you drop the 100 POI by 4 MOA you're 0.8" low at that range. Army spec is to use the 0-2 ap for "close range, low light, or moving targets" so that sight is lower to adjust for that range. that's what I meant by "using the sight as designed." For duty use you're better off zeroing with the large (0-2) ap and leaving it be. Use of a same plane ap is also an option as is an Aimpoint.  |
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Posted: 9/27/2005 8:24:29 PM EDT
[#18]
i gotta headach
ok if i zero it with the 0/200 ring can i do it at 25 or 36 yards? |
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