Mil Dots

savagehunter308 · January 13, 2002, 08:26 PM

how big is one mildot at 100 yards on 9x?

rock_jock · January 13, 2002, 08:52 PM

I think it wouild depend on how far apart the dots are placed on your particular brand of scope.

Azrael256 · January 13, 2002, 09:59 PM

It has nothing to do with the brand of scope, OR the magnification. The dot denotes an angle, not a distance. Each dot is one miliradian. At varying powers it will appear bigger or smaller, but it's still the same angle. A radian is a measure using 2Pi as the circumference instead of 360 degrees. A radian is approximately 57.3 degrees. A miliradian is 1/1000th this distance, or .0573 degrees. The tangent of .0573 degrees is equal to the deviation one milliradian will produce divided by the range.

Tan(.0573)=.0010001

.0010001=(deviation)/100yd

this gives us about .10001 yard, which is 3.60036 inches.

vitiaz · January 14, 2002, 02:59 AM

Army dots(round) or USMC dots(oval)?

M Gruber · January 14, 2002, 03:53 AM

For a good overview on MOA and Mildots and their spacing....

www.premierreticles.com

echo3mike · January 14, 2002, 03:59 AM

http://www.swfa.com/mildot/screview.html

http://www.swfa.com/mildot/milreview.html

http://www.shooterready.com/classdemo.html

http://www.shooterready.com/rangegame.html

http://www.premierreticles.com

One miliradian at 100 yds subtends out to be ~3.6 ". This is on a 10X scope, (or whatever scope the reticle is design to accomodate). One mildot (Army) subtends 0.75" at 100yds...Marine mildot subtends 0.86" at 100 yds.

If I'm not mistaken, only the Springfield scopes have a reticle that correct for changes throughout the power range. Most others will only correspond to either the 10X or the highest power on the scope.

I would think that for a scope with a 9X mag power, the subtensions would be the same.

STLRN · January 14, 2002, 06:49 AM

A mil is a unit of angular measurement developed for use by artillerymen in the western world. It has been adopted by non-artillerymen for direct fire use, because it conveniently subtends approximately 1 meter for every 1000 meters from the measuring device. It is an approximation because you are converting an angular sweep into a straight-line. In order to accomplish this you normally have to divide by 1.0186 after you have done the mil relation formula. A mil is not a Milaradian.

Schmit · January 14, 2002, 09:05 AM

Quote:

One miliradian at 100 yds subtends out to be ~3.6 ". This is on a 10X scope, (or whatever scope the reticle is design to accomodate). One mildot (Army) subtends 0.75" at 100yds...Marine mildot subtends 0.86" at 100 yds.

Or to put it in easy terms a Jarhead can understand is that the Marine Mildot subtends 1/4 Mil with 3/4 Mil between dots.

M700 · January 14, 2002, 12:39 PM

echo3mike,

US Optics also makes scopes with the reticle in the first focal plane allowing mildot ranging at any power. I believe that nightforce offers these as well.

savagehunter308 · January 15, 2002, 10:24 PM

the retricle is on a leupold vari x II tactical

January 13, 2002, 08:26 PM	#1
savagehunter308 Senior Member Join Date: June 28, 2001 Location: Cave Creek, AZ Posts: 134	Mil Dots how big is one mildot at 100 yards on 9x? __________________ "Forgive them not....For the know exactly what they do"

January 14, 2002, 02:59 AM	#4
vitiaz Senior Member Join Date: November 17, 2000 Posts: 158	Army dots(round) or USMC dots(oval)? __________________ Molon labe

January 14, 2002, 03:59 AM	#6
echo3mike Senior Member Join Date: September 12, 2000 Location: Chantilly, VA...Just barely behind the lines! Posts: 490	http://www.swfa.com/mildot/screview.html http://www.swfa.com/mildot/milreview.html http://www.shooterready.com/classdemo.html http://www.shooterready.com/rangegame.html http://www.premierreticles.com One miliradian at 100 yds subtends out to be ~3.6 ". This is on a 10X scope, (or whatever scope the reticle is design to accomodate). One mildot (Army) subtends 0.75" at 100yds...Marine mildot subtends 0.86" at 100 yds. If I'm not mistaken, only the Springfield scopes have a reticle that correct for changes throughout the power range. Most others will only correspond to either the 10X or the highest power on the scope. I would think that for a scope with a 9X mag power, the subtensions would be the same. __________________ God, Country, Corps! "Only Accurate Rifles Are Interesting" Col. Townsend Whelen Por Libertate Patriae TFL Alumni

January 14, 2002, 06:49 AM	#7
STLRN Senior Member Join Date: October 28, 1999 Location: USA Posts: 1,163	A mil is a unit of angular measurement developed for use by artillerymen in the western world. It has been adopted by non-artillerymen for direct fire use, because it conveniently subtends approximately 1 meter for every 1000 meters from the measuring device. It is an approximation because you are converting an angular sweep into a straight-line. In order to accomplish this you normally have to divide by 1.0186 after you have done the mil relation formula. A mil is not a Milaradian. __________________ God truly fights on the side with the best artillery

January 15, 2002, 10:24 PM	#10
savagehunter308 Senior Member Join Date: June 28, 2001 Location: Cave Creek, AZ Posts: 134	the retricle is on a leupold vari x II tactical __________________ "Forgive them not....For the know exactly what they do"

January 13, 2002, 08:52 PM	#2
rock_jock Senior Member Join Date: January 19, 2000 Location: SE Texas Posts: 1,779	I think it wouild depend on how far apart the dots are placed on your particular brand of scope.

January 13, 2002, 09:59 PM	#3
Azrael256 Senior Member Join Date: November 27, 2001 Location: Oklahoma City, OK Posts: 547	It has nothing to do with the brand of scope, OR the magnification. The dot denotes an angle, not a distance. Each dot is one miliradian. At varying powers it will appear bigger or smaller, but it's still the same angle. A radian is a measure using 2Pi as the circumference instead of 360 degrees. A radian is approximately 57.3 degrees. A miliradian is 1/1000th this distance, or .0573 degrees. The tangent of .0573 degrees is equal to the deviation one milliradian will produce divided by the range. Tan(.0573)=.0010001 .0010001=(deviation)/100yd this gives us about .10001 yard, which is 3.60036 inches.

January 14, 2002, 03:53 AM	#5
M Gruber Member Join Date: December 26, 2000 Posts: 71	For a good overview on MOA and Mildots and their spacing.... www.premierreticles.com

January 14, 2002, 12:39 PM	#9
M700 Senior Member Join Date: January 16, 2000 Location: Setauket, NY Posts: 578	echo3mike, US Optics also makes scopes with the reticle in the first focal plane allowing mildot ranging at any power. I believe that nightforce offers these as well.