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kcajeel
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Mills to Inches
Mar 13th, 2017 at 11:20am
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I'm looking at new scopes and lots of them refer to mills instead of inches can someone tell me the difference between a mill and an 1/8" or 1/4"  at a hundred yards?

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Re: Mills to Inches
Reply #1 - Mar 13th, 2017 at 11:29am
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Re: Mills to Inches
Reply #2 - Mar 13th, 2017 at 2:06pm
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Nice article.

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rgchristensen
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Re: Mills to Inches
Reply #3 - Mar 14th, 2017 at 2:26pm
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As far as the US military is concerned, there are TWO different "mils", the "Infantry" mil, and the "Artillery" mil.   They are not much different, but SOMEWHAT different.   I forget which is which, but one is 1000x2xpi per circle, and the other is 6400 per circle.

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Re: Mills to Inches
Reply #4 - Mar 14th, 2017 at 5:17pm
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rgchristensen wrote on Mar 14th, 2017 at 2:26pm:
As far as the US military is concerned, there are TWO different "mils", the "Infantry" mil, and the "Artillery" mil.   They are not much different, but SOMEWHAT different.   I forget which is which, but one is 1000x2xpi per circle, and the other is 6400 per circle.

CHRIS
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Thank you, Chris!  It is the Artillery 'Mil' that has 6400 per circle.  (Comes from the French circa WWI when we were just figuring out modern artillery with the French 75.)

  

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Re: Mills to Inches
Reply #5 - Dec 29th, 2020 at 4:18pm
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Infantry mill is 6200. Or was 1967-69
  
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Re: Mills to Inches
Reply #6 - Dec 30th, 2020 at 9:09am
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So what is the significance of 6400 or 6200 per circle?
  
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Re: Mills to Inches
Reply #7 - Jan 2nd, 2021 at 8:54pm
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both are angular measurements.
devices for measuring the angles are in mils; as the M2 aiming circle ( a 4x transit used by the artillery).  The coordinates (of where you are) are surveyed from a known point to where the battery is.  From that point each cannon (the sight there of) is registered to the known point.  Then when the adjustments from the FDC (fire direction control) are given, each cannon sets elevation and azimuth, sets the charge and fuse, and on command fires.  Adjustments are then given to raise or lower - in mils.   

.    We use minute of angle and the number of clicks to adjust such on our scopes at 100 yards.   
  

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sharps
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Re: Mills to Inches
Reply #8 - Jan 6th, 2021 at 1:51pm
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i have a bushnell and leupold graduated in .1mils adjustments, i go w/ 3cliks[.3mil] = 1moa, it's close enough for my shooting, but as range increases so do adjustment values  @ 600yds 3cliks [.3] = 7+ inches                             best wishes
  
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Re: Mills to Inches
Reply #9 - Feb 26th, 2021 at 4:06pm
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A Radian is the length of the arc of a circle divided by 2x Pi. It's not an angle, per se. It's an irrational number, the decimals never end, and it can't be perfectly divided by anything.

Hence, if you want to make a dial of some sort, you've got to round it off and hope you never have to make a huge adjustment that has to be accurate. With multiple turns, the error is going to keep adding.

A 'Mil' would be about 6283 per turn. Could use 6300, but 6200 and 6400 are more easily divisible. No idea why one or the other.

I guess they work great for various engineering and astrophysics stuff involving rotation, radial velocities, etc. But you'll never see a rotary table in Radians Wink
  
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Re: Mills to Inches
Reply #10 - Feb 26th, 2021 at 4:43pm
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For cast bullet competition you would probably not want a scope in Mills. They are better served for those shooting tactical competitions. What type of scope are looking at the reason I ask is you probably cannot find one better than the Nightforce BR scopes. I had a 12X42BR once and the optics and the click adjustments for elevation and windage where absolutely outstanding. I would send it every couple of years to have it cleaned and checked and it was also at no charge to me. Other than them cleaning it no other work had to be preformed and it was all part of their warranty.
  

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Re: Mills to Inches
Reply #11 - Feb 26th, 2021 at 5:52pm
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JLouis wrote on Feb 26th, 2021 at 4:43pm:
For cast bullet competition you would probably not want a scope in Mills. They are better served for those shooting tactical competitions. What type of scope are looking at the reason I ask is you probably cannot find one better than the Nightforce BR scopes. I had a 12X42BR once and the optics and the click adjustments for elevation and windage where absolutely outstanding. I would send it every couple of years to have it cleaned and checked and it was also at no charge to me. Other than them cleaning it no other work had to be preformed and it was all part of their warranty.

"Mils" not "Mills"
  

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Re: Mills to Inches
Reply #12 - Sep 2nd, 2021 at 2:49pm
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Thank you John. It's only been up there almost 5 years and you are the first to mention that I misspelled. I should have known.
  
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