Measuring Mildot spacing....???

Measuring Mildot spacing....???

Joined: March 1st, 2002, 12:22 am

July 19th, 2012, 5:16 pm #1


an extensive search of s acouple forums, and googling didnt turn up what I'm looking for

I need to be able to measure/calculate the dot spacing on the reticle itself. Its not listed in the miniscle users guide that came with the scope

This scope has hash ticks/lines instead of dots. Chairgun wants to know the dot to dot spacing for its math.

google did turn up how to use the dots to range a en elk, mountain goats and the headlight spacing on a Hudson coupe, but nothing to say how far apart the dots/hashes are in the reticle itself

One thing Ive thought of, is to take one shot at 10 yards using the "center" dot , raise or lower the scope one dot/tick and shot at the same aim point. Then meausure that CtC distance and multiply that by 10 to give a 100 yard spacing.

Example: my 10 yard spacing ctc is .39 inches. times 10 (for the 100 dot to dot spacing) thus giving 3.9 for the dot to dot spacing.

yes no maybe?

EDIT: Update...... using a search term of "mil dot calibration" on the Yellow's FT sub-froum got a lot more hits, including Ray's write up (see below)


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Last edited by dan_house on July 19th, 2012, 6:38 pm, edited 1 time in total.
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Joined: May 1st, 2008, 3:43 pm

July 19th, 2012, 5:51 pm #2

one mil is 3.375 MOA - but you shouldn't have to shoot to measure. If you have a grid at a given distance all you have to do is look through the scope and observe the difference. You might also be interested in the write-up I did on mil-dot ranging for FT. It talks about 'calibrating' your actual values - I think that might be of interest to you. You'll find it at idahoairguns.org - look in the documents link.
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Joined: March 1st, 2002, 12:22 am

July 19th, 2012, 6:37 pm #3

an extensive search of s acouple forums, and googling didnt turn up what I'm looking for

I need to be able to measure/calculate the dot spacing on the reticle itself. Its not listed in the miniscle users guide that came with the scope

This scope has hash ticks/lines instead of dots. Chairgun wants to know the dot to dot spacing for its math.

google did turn up how to use the dots to range a en elk, mountain goats and the headlight spacing on a Hudson coupe, but nothing to say how far apart the dots/hashes are in the reticle itself

One thing Ive thought of, is to take one shot at 10 yards using the "center" dot , raise or lower the scope one dot/tick and shot at the same aim point. Then meausure that CtC distance and multiply that by 10 to give a 100 yard spacing.

Example: my 10 yard spacing ctc is .39 inches. times 10 (for the 100 dot to dot spacing) thus giving 3.9 for the dot to dot spacing.

yes no maybe?

EDIT: Update...... using a search term of "mil dot calibration" on the Yellow's FT sub-froum got a lot more hits, including Ray's write up (see below)


dr_subsonic's pneumatic research lab
<img alt="[linked image]" src="http://img.photobucket.com/albums/v301/ ... od-1-1.jpg">
the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremacy
Proud Sponsor of team_subsonic
That will get me way down the road. More homework, but I canlive with the math  and a tape measure for an evening

dr_subsonic's pneumatic research lab

the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremacy
Proud Sponsor of team_subsonic
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Joined: February 17th, 2010, 3:30 am

July 19th, 2012, 6:39 pm #4

an extensive search of s acouple forums, and googling didnt turn up what I'm looking for

I need to be able to measure/calculate the dot spacing on the reticle itself. Its not listed in the miniscle users guide that came with the scope

This scope has hash ticks/lines instead of dots. Chairgun wants to know the dot to dot spacing for its math.

google did turn up how to use the dots to range a en elk, mountain goats and the headlight spacing on a Hudson coupe, but nothing to say how far apart the dots/hashes are in the reticle itself

One thing Ive thought of, is to take one shot at 10 yards using the "center" dot , raise or lower the scope one dot/tick and shot at the same aim point. Then meausure that CtC distance and multiply that by 10 to give a 100 yard spacing.

Example: my 10 yard spacing ctc is .39 inches. times 10 (for the 100 dot to dot spacing) thus giving 3.9 for the dot to dot spacing.

yes no maybe?

EDIT: Update...... using a search term of "mil dot calibration" on the Yellow's FT sub-froum got a lot more hits, including Ray's write up (see below)


dr_subsonic's pneumatic research lab
<img alt="[linked image]" src="http://img.photobucket.com/albums/v301/ ... od-1-1.jpg">
the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremacy
Proud Sponsor of team_subsonic
Set up some 0.1" grid graph paper (the kind with heavier lines at 0.5" and even heavier at 1.0" spacing) at exactly 20 yards from the bell of the scope.... Prop the gun solidly in sandbags, etc. so that it doesn't move.... Aim the top dot at the top edge of the grid on the paper.... Look at the bottom dot, and see where it lines up on the paper.... Write down how far that measures using the grid on the graph paper.... Using more than one dot increases the accuracy of the measurement - 10 dots is 10 times as easier to measure accurately than one dot.... ie gives you one more decimal point in the results.... If you use 5 dots at 20 yards (or 10 dots at 10 yards) you don't even need to do any calculations, just use that measurement for the 100 yard MilDot height....

For example, one of my scopes at 10X measured exactly 7.0" for a distance of 10 dots.... ie 0.70" per dot at 20 yards.... That would be 0.70 x 100 / 20 = 3.50" per dot at 100 yards.... One MilDot is supposed to be 3.600" (3.438 Minutes of Angle) at 100 yards, so it's pretty close.... You would use the 3.50" figure at 100 yards in the "Calculate DotSep (MoA/Dot)" Widget in the "Tools/Calculators" menu in ChairGun to correct your trajectory chart.... If you change the power, the value changes (unless you have an FFP scope)....

Bob
Last edited by rsterne on July 19th, 2012, 6:44 pm, edited 1 time in total.
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Joined: June 25th, 2007, 3:02 pm

July 19th, 2012, 8:44 pm #5

an extensive search of s acouple forums, and googling didnt turn up what I'm looking for

I need to be able to measure/calculate the dot spacing on the reticle itself. Its not listed in the miniscle users guide that came with the scope

This scope has hash ticks/lines instead of dots. Chairgun wants to know the dot to dot spacing for its math.

google did turn up how to use the dots to range a en elk, mountain goats and the headlight spacing on a Hudson coupe, but nothing to say how far apart the dots/hashes are in the reticle itself

One thing Ive thought of, is to take one shot at 10 yards using the "center" dot , raise or lower the scope one dot/tick and shot at the same aim point. Then meausure that CtC distance and multiply that by 10 to give a 100 yard spacing.

Example: my 10 yard spacing ctc is .39 inches. times 10 (for the 100 dot to dot spacing) thus giving 3.9 for the dot to dot spacing.

yes no maybe?

EDIT: Update...... using a search term of "mil dot calibration" on the Yellow's FT sub-froum got a lot more hits, including Ray's write up (see below)


dr_subsonic's pneumatic research lab
<img alt="[linked image]" src="http://img.photobucket.com/albums/v301/ ... od-1-1.jpg">
the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremacy
Proud Sponsor of team_subsonic
Ballistic Enterprises #1 513 490 0035 "GO BALLISTIC!!!!" BE#1
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Joined: March 1st, 2002, 12:22 am

July 20th, 2012, 4:57 pm #6

more homework......

dr_subsonic's pneumatic research lab

the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremacy
Proud Sponsor of team_subsonic
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Joined: February 21st, 2009, 1:05 pm

July 20th, 2012, 6:34 pm #7

1MD is same size as JSB 500 Tin 3 5/8".....Franky

http://www.youtube.com/watch?v=9X3SLsla ... ature=plcp
Last edited by 21grains on July 24th, 2012, 7:56 pm, edited 1 time in total.
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