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1 MOA at 100 Meters |
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smity25ca
Optics GrassHopper Joined: January/02/2006 Location: Canada Status: Offline Points: 16 |
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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. |
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Speed is Fine Accuracy is Finnal (Wyatt Earp)
Ian J. Smith (Cpl) Camp Borden |
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silver
Optics Master Joined: November/04/2005 Location: United States Status: Offline Points: 2291 |
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~26 or 27 mm
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"If we weren't all crazy we, We would go insane." Jimmie Buffet
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smity25ca
Optics GrassHopper Joined: January/02/2006 Location: Canada Status: Offline Points: 16 |
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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. |
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Speed is Fine Accuracy is Finnal (Wyatt Earp)
Ian J. Smith (Cpl) Camp Borden |
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silver
Optics Master Joined: November/04/2005 Location: United States Status: Offline Points: 2291 |
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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. |
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"If we weren't all crazy we, We would go insane." Jimmie Buffet
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cheaptrick
MODERATOR Joined: September/27/2004 Location: South Carolina Status: Offline Points: 20844 |
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You guys got me dizzy!!!!!!
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If at first you don't secede...try..try again.
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pascalp
Optics GrassHopper Joined: September/22/2005 Status: Offline Points: 3 |
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Minute Of Angle:
Tangente minute 100m = 0,02908m = 29,1mm
Tangent ( 1° / 60 * 100y ) = 0.02908y = 1.04688 inch |
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CavscoutSniper
Optics GrassHopper Joined: August/08/2008 Location: Texas Status: Offline Points: 14 |
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Actually 100 Meters is 109 Yards.
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CavscoutSniper
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sun-sense
Optics GrassHopper Joined: March/25/2011 Location: Florida Status: Offline Points: 3 |
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No, its even larger as it is 1.047 at 100 yards and 100 meters is 109 yards, therefore it is 1.141 inches. |
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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 6253 |
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trigger29
Optics Master Extraordinaire X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ? Joined: September/29/2007 Location: South Dakota Status: Offline Points: 4353 |
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"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." |
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dsr
Optics Apprentice Joined: May/31/2007 Location: United States Status: Offline Points: 244 |
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100
=1.14523 inch
dsr
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sun-sense
Optics GrassHopper Joined: March/25/2011 Location: Florida Status: Offline Points: 3 |
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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 |
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sun-sense
Optics GrassHopper Joined: March/25/2011 Location: Florida Status: Offline Points: 3 |
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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. |
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hunterwingler
Optics Master Joined: April/03/2009 Location: Idaho Status: Offline Points: 1420 |
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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.
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I wasn't upset about the black cat crossing my path this morning but mouthing "your fu@#ed" as he passed was just rude.
If Guns kill people mine are all defective |
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trigger29
Optics Master Extraordinaire X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ? Joined: September/29/2007 Location: South Dakota Status: Offline Points: 4353 |
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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.
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"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." |
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338LAPUASLAP
Optics Master Scope Swapper Joined: October/17/2009 Status: Offline Points: 2596 |
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or at short ranges with small bullets...j/k but no really they do...
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No one
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308 Sav
Optics Journeyman Joined: July/18/2010 Location: Kentucky Status: Offline Points: 362 |
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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.
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Gerald Baker
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stickbow46
Optics Master Extraordinaire Joined: January/07/2009 Location: Benton, Pa Status: Offline Points: 4678 |
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You need 50 post to be able to modify your post!
Welcome to the OT!
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Pearls of Wisdom are Heard not Spoken
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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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"... |
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jonoMT
Optics Master Extraordinaire Joined: November/13/2008 Location: Montana Status: Offline Points: 4853 |
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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. |
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Reaction time is a factor...
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