[OverArmedNewb]

My ACR, there are many like it but this one is mine.

 

[losman]

nice optics

 

[OverArmedNewb]

Its the 557 AR 223 which has a reticle calibrated for .223 trajectory. It co-witnesses with the MBUS. Now just to sight it all in. It heavys up the rifle though.

 

[losman]

I would probably sight in the Eotech first (at the 50 yds line) and then just line up the front post to the red dot. Eat your Wheaties

 

[OverArmedNewb]

Yeah that sounds like it would be the easiest way. I was wondering where would be the best distance for sighting this rifle. I looked at the arc for 55grain .223 ammo in a chart I found online, and the bullet looks like it rises out of the barrel, peaks at 100yds, crosses the bore line at 300yds then drops off more rapidly. I was wondering if 25yds or 50yds works better or if it really makes any difference at all.

 

[losman]

At our rifle club, they will not let you place your target any closer than 50 yds. Place the target there if it's anything like I experienced ( i sighted the rifle using the MBUS sight) i had to crank down the front post approx three full turns to get on a 10 inch circle. The in initial point of impact when I aimed at the bullseye at the 50 yds mark was about 2 - 2.5 feet low. I then cranked the front post in increments of full revolutions took a shoot saw where it hit cranked it down again, fired see where it hit ...until I got the bullets climbing up in the X ring. Hopefully there will no wind (even though any wind at 50 yds is not going to matter much if any) and you can your windage sighted in.

55gr bullets are fine for sighting and anything else. It took me about 25 mins to do the whole process. I also hand a scoping scope to help me see where the bullets where hitting ...also get some target that light up the bullet hits....they make a world of difference.
http://www.youtube.com/watch?v=wE_-S8in7J8

 

[OverArmedNewb]

So I guess 50 yds it is. I am itching to get out there. Next month can't come soon enough.

 

[DSM]

Yep, 50yds is probably the best all around BZO for 5.56. It'll keep you point of aim-point of impact to 200yds and even out to 300yds with a slight 12 o'clock hold. That's the zero on my rifles and the steel at our range isn't safe, at 200 or 300 yards.

 

[losman]

Yep, 50yds is probably the best all around BZO for 5.56. It'll keep you point of aim-point of impact to 200yds and even out to 300yds with a slight 12 o'clock hold. That's the zero on my rifles and the steel at our range isn't safe, at 200 or 300 yards.

thats good to know

 

[tankertrooper]

thats good to know

25 meter zero will set you for 300 meter zero. that is how the army does it

 

[Psybain]

36m target is required for an accurate 300m zero... but depending on how the range you're at is marked, it might be easier to just do a 25m or 30m zero. Either way, you'll be pretty close to poa at 300m.