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Last edited by FLIGHT762; 11-24-2013, 8:17 PM. -
Well, after much reading I went ahead and re-zeroed at 50yds. It was only a click off. Then I also zeroed my Burris scope @ 50 yds. Had a little friendly competition and nailed 9 of 10 in a 2" BE... I think that's dialed in now!
Although at 100yds I was 2-4" high on most shots."Laws that forbid the carrying of arms...disarm only those who are neither inclined nor determined to commit crimes. Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than prevent homicides, for an unarmed man may be attacked with greater confidence than an armed one.
--Thomas JeffersonPolitics is the art of looking for trouble, finding it everywhere, diagnosing it incorrectly and applying the wrong remedies. --Groucho MarxComment
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---not my creation---
The USMC zeroes all weapons with the small rear sight aperture and adjusts for a 300 meter zero. USMC defines the Battlesight Zero as the following:
• The front sight post and rear sight windage knob are adjusted so you can hit your point of aim at 300 meters.
• The unmarked (small) aperture must be in the up position.
• The 300-meter mark is aligned with the mark on the left side of the receiver (6/3 for M16A4 and M4, 8/3 for M16A2).
On the AR-15, a “z” can be found 2 clicks above the “6/3” setting. You must adjust your rear sight elevation to this setting and use the small rear sight aperture. With this setting, the rifle will achieve a point-of-aim, point-of-impact at 25 meters which achieves a 300 meter battlesight zero. To place your actual 300 meter zero on the rifle, rotate the rear sight elevation knob 2 clicks down back to “6/3.”
The rear sight aperture (unmarked) flips forward to expose a larger aperture marked 0-2. Use the 0-2 aperture only when the 3 is aligned with the mark on the left side of the receiver. You will automatically get a zero of 200 meters. Use the 0-2 aperture when shooting at night or at close range.
With a 300 meter zero on your rifle, the sight crossings are at 37 meters and 300 meters. Anything you shoot between these distances will result in a high strike (or require you to hold under the target like the Army teaches) unless you flip to the 0-2 aperture. Interestingly, no firing ranges in the US are surveyed to fit this type of setup and distances except for Marine Corps ranges (the US Army uses this same procedure now but their ranges are built for an older procedure which was not mathematically
correct).
Front Sight Elevation Rule:
One click of front sight elevation adjustment will move the strike of the bullet on the target approximately 1 1/4” (M16A2 & A4) and 2” (M4 carbine) for every 100 yards of range from the target.
Rear Sight Elevation Rule:
One click of rear sight elevation adjustment will move the strike of the bullet on the target approximately 1” (M16A2 8/3 dial), 0.5” (M16A4 6/3 dial) and (M4 carbine 6/3 dial) for every 100 yards of range from the target.
Windage Rule:
One click of windage adjustment will move the strike of the bullet on the target approximately 1/2” (M16A2, M16A4) & 3/4” for the M4 carbine for every 100 yards of range from the target.RKBA Clock: soap box, ballot box, jury box, cartridge box (Say When!)
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Sight in with small aperture at 37/300 meters with the USMC BZO procedure,
which you can sight in at 25 meters with the 8/3 "z" setting,
then the small aperture will give a 50/200 zero automatically.
The small aperture is intended to be zeroed for a 300 meter zero
using M855 fired from a 20” barreled M16A2.
The 0-2 large aperture is intended to provide a 200 meter zero,
when the small aperture has been properly zeroed with M855 from
a 20” barreled M16A2.
If you examine the trajectories of M855 fired from a 20” barreled M16A2
zeroed at 300 meters, and at 200 meters, you will see that the
difference in elevation between these two trajectories (and hence the
difference in elevation between the small and large apertures) is 2.5 MOA.RKBA Clock: soap box, ballot box, jury box, cartridge box (Say When!)
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