MOA Arithmetic and ...
 

MOA Arithmetic and Zeroing a Red Dot Sight  

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Droidiphile
(@droidiphile)
Joined: 11 months ago
Posts: 41
2019-08-09 12:04:55  

Can anyone provide the MOA math and methodology to zero a red dot?  I think I know how, in theory, but I seem to be spending excessive trial and error time.  Nor can I achieve a really tight bullseye.  Consistently tight groups, yes, but all deviated from the bullseye.  Yes, I'm using a bench rest, and my normal mode is targets at 1o meters. 

I'm sure there are standard methods to rapidly converge on zero.  The articles I've read suggest trial and error, as in, "adjust so the point of impact is where it is intended" ... duh, that ain't quite enough info...

So would someone be kind  enough to write a "Red Dot Zeroing Guide for Dummies", or provide links?

Thanks guys!  Go in peace!


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Doug Wall
(@doug-wall)
Joined: 2 years ago
Posts: 111
2019-08-09 17:12:12  

A MOA is about  1" at 100 yards. That would be about 0.1" at 10. yards. A 1/4 min. per click adjustment optic, would move the impact 0.025" per click at 10 yards.


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Hector J Medina G
(@hector-j-medina-g)
Member of Trade
Joined: 2 years ago
Posts: 286
2019-08-09 17:23:26  

If you could somehow backlight your target and put your rifle in a vise, then you need to shoot one shot, backlight the target, then move the turrets so that the red dot and the light that passes through the pellet hole coincide.

 

HTH

 

 

 

 

 

HM


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marflow
(@marflow)
Joined: 2 years ago
Posts: 631
2019-08-09 18:52:26  

seeing we have no idea what model you have but it really doesn't matter, it's got a red dot and the dot is your crosshairs

just walk it in as you would adjusting any scope

it seems that you can shoot well enough with it, twist the knobs

if you are out of elevation or windage adjustments, then that's another story all together

you got to where you are by twisting the knobs, keep twisting

Mike


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James Perotti
(@jpsaxnc)
Joined: 2 years ago
Posts: 74
2019-08-10 09:02:08  

It might help to use the red dot like iron sites. Instead of covering the point you want to hit with the dot, (if that's what you are doing) adjust the site so that the point you want to hit, sits just above the dot.  HTH


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Droidiphile
(@droidiphile)
Joined: 11 months ago
Posts: 41
2019-08-15 16:38:20  

I poked around the web and found this YT video.  This seems like an efficient method to me.  What do you guys think?


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marflow
(@marflow)
Joined: 2 years ago
Posts: 631
2019-08-16 03:08:15  

should I assume you have never adjusted a scope of any kind

because that video shows nothing more then scope adjustment and it does not matter if the scope is  a red dot or optic or for that matter open sights

you adjust and test on all sights until you are on target

if the video helps that's great but it is very rudimentary  info

 

Mike


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dcw
 dcw
(@dcw)
Joined: 2 years ago
Posts: 61
2019-08-16 18:48:34  

red dot...scopes? adjust all the same. it's just where (what distance) you zero it to. the more acute the zero at longer distance, the more accurate it will be at close range.


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Steve in NC
(@steve-in-nc)
Dealer
Joined: 2 years ago
Posts: 329
2019-08-16 21:54:06  
Posted by: @droidiphile

Can anyone provide the MOA math and methodology to zero a red dot?  I think I know how, in theory, but I seem to be spending excessive trial and error time.  Nor can I achieve a really tight bullseye.  Consistently tight groups, yes, but all deviated from the bullseye. 

The thing about dotters is that none (at least none I've seen) has an AO, and therefore (despite advert hype to the contrary) are all vulnerable to parallax error at any range except the one programmed at the factory -- usually 50yds.  This fact, combined with their big exit pupils (often as large as 20 or 30mm -- several or more times that of a typical scope), makes accuracy very dependent on consistent eye positioning.

Sounds like you may be having trouble with that detail.


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fwwbronco
(@fwwbronco)
Joined: 1 month ago
Posts: 10
2019-08-17 13:45:33  

@hector-j-medina-g

l like to shoot 3 rounds and adjust for center of mass

 


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Hector J Medina G
(@hector-j-medina-g)
Member of Trade
Joined: 2 years ago
Posts: 286
2019-08-17 20:37:58  
Posted by: @fwwbronco

@hector-j-medina-g

l like to shoot 3 rounds and adjust for center of mass

 

Yes, that is a good idea, once you are on paper.

Using the backlit method you can start at 10 yards and have a REALLY GOOD approximation to where you want to be in a few shots, then you can shoot three (or 5) and adjust for center of group.

😉

 

 

HM


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