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1 MOA at 100 Meters

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/02/2006 at 20:53
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Here's an MOA question. If 1 MOA equals 1 inch or 1.047197580733" to be precise at
a 100 yard distance what would it be at a 100 meter distance? As all the ranges up
here in Canada are in meters.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/03/2006 at 08:07
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~26 or 27 mm
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/03/2006 at 08:57
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I see, so at 100 meters it's even closer to 1" than 100 yards it's 1.02362" instead of
1.047197580733" nice to know that there's not a real differance it's only about a 1/4" truer
at a 1000 meters.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/03/2006 at 09:30
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One inch equals 25.4mm

100 meters 110 yards or 110 % so I added 10% and rounded down, just a hair.  Reason most people tend to over estimate range. As you noted the culmative error is not much. I like things to be a hair under than over for most things.  27.5mm would be a text book answer which most people would then make 28mm. I just applied some error correction early.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/03/2006 at 11:12
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/06/2006 at 04:45
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Minute Of Angle:

 

Tangente minute  100m  = 0,02908m = 29,1mm

 

Tangent ( 1° / 60  *  100y ) = 0.02908y = 1.04688 inch

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/08/2008 at 09:43
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Actually 100 Meters is 109 Yards.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 09:58
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Originally posted by smity25ca smity25ca wrote:

I see, so at 100 meters it's even closer to 1" than 100 yards it's 1.02362" instead of
1.047197580733" nice to know that there's not a real differance it's only about a 1/4" truer
at a 1000 meters.



No, its even larger as it is 1.047 at 100 yards and 100 meters is 109 yards, therefore it is 1.141 inches.


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 11:13
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 Moa are a group of flightless birds with no vestiges of wing bones.
 
Oops, wrong moa.
 

In metric units1 MOA at 100 meters = 2.908 centimeters. (1.144inches)



Edited by 8shots - March/25/2011 at 11:16
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 12:07
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X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ?

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Originally posted by sun-sense sun-sense wrote:

Originally posted by smity25ca smity25ca wrote:

I see, so at 100 meters it's even closer to 1" than 100 yards it's 1.02362" instead of
1.047197580733" nice to know that there's not a real differance it's only about a 1/4" truer
at a 1000 meters.



No, its even larger as it is 1.047 at 100 yards and 100 meters is 109 yards, therefore it is 1.141 inches.


This is correct.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 13:20
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100 meters * (100 centimeters/meters)*(1 inch/(2.54 centimeter))*Tangent (1/60 degree)
=1.14523 inch
 
 
dsr
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 13:41
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KISS.

1\60 = 1.666666666667e-02 of which the tangent = 2.908882168703e-04

109 (yards) x 36 (inches) = 3,924 inches.

2.908882168703e-04 x 3,924 = 1.141


An easier way if you already believe/know that 1 MOA = 1.047 inches at 100 yard.

1.047/100  then multiply by 109 = 1.141




Edited by koshkin - March/25/2011 at 14:45
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 13:46
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Oop's.  Sorry.

Delete that first line.  I realized it wasn't right a split second after I submitted it.

For some reason I can't edit. 

I think it really depends on how many decimal places you are using to do the calculations.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 15:44
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IDK about u guys but would be easier just range everything in yard than meters? I do believe most ranger finder now a days have both choses on them.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 16:11
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X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ?

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Unless you own a Leica. Either way, you're splitting hairs on moa.......... But at loooong ranges, these things do count.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/10/2011 at 14:26
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or at short ranges with small bullets...j/k but no really they do...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/10/2011 at 16:29
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Originally posted by hunterwingler hunterwingler wrote:

IDK about u guys but would be easier just range everything in yard than meters? I do believe most ranger finder now a days have both choses on them.

Not if you are used to the metric system and it is second nature to you. Use what you are used to.

and what is harder  1 moa =  1.047 at 100 yards or 1 moa = 29.1mm at 100m
I would say if you use the metric system then you would choose the latter of you use iffy you would choose the first.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/10/2011 at 22:03
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/10/2011 at 23:56
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100 meters is NOT 109 (or 110) yards, but 109.361 yards.  

You can only ignore the part of the fraction that you cannot correct with your scope adjustments...  how much precision does your instrument allow?  If you "ignore" a part of the fraction, how much is it compounded over range?  

1/4MOA is more precise than .1Mil, but using a .1mil/mil=dot scope is easier than using a MOA/mil-dot scope...even though that has been the most common combination for quite some time (in the US, anyway).  I would prefer to use MOA/MOA, but there aren't enough of those around.  1 "click" with a 1/4 MOA scope (1/4 MOA true) = .26175inch (4 "clicks = 1.047 inch at 100 yards).  1"click" with a .1mil scope = 0.36 inch (3 "clicks" = 1.08 inch" at 100 yards)  If your scope is truly .25in/click at 100 yards, it is .12 inches in error/click... 10 clicks is 1.2 inches in error.  Just things to consider...  
How accurate is your ability to judge distance?  If it is only off by +/- a yard, how much does an inch or so here or there matter?
Finding MOA calibrated reticles has only recently been in "vogue"...


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/11/2011 at 06:12
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If there was ever a case for a shooter to switch to a scope with mil turrets and mil reticles it would be shooting in metric distances. Mils are not metric (although it is common among some European manufacturers to mark their turrets with "1 click = 1 cm"). But both are decimal-based systems so it's easier to correlate the two. Shooters using yards can obviously take advantage of equating inches with MOA, but that's just a convenient mathematical coincidence.

Regardless of which system you use, it pays to get used to thinking in terms of angular corrections. Both MOA and mils are measurements of angularity, not of physical units. Naturally, we want to know and be able to translate those into some physical unit of measure. But as far as shooting goes, that can just be in the back of your mind. It's a lot easier to look through your reticle and say I need to come up .2 mils and dial that in with a matching turret. (Same with MOA/MOA scopes).

Also, take a look at leads sometime in a ballistics calculator. While drops increase drastically with distance, leads don't. Yet if you tried to think in inches or cm, the calculation gets rougher than just noting the angular lead. For example, on a target moving 10 mph the distance covered is 20" @ 100 yards, but 114" @ 500 yards on one of my loads. There's no quick way with a reticle that you're going to be able to convert those units into a correct. But if I look at the ballistics table, the correction is 5.6 mils @ 100 yards and 6.2 mils @ 500 yards. Then it becomes easy to interpolate for distances in between. For 300 yards I can just correct 5.9 mils with the reticle.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/25/2011 at 21:22
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