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Mil Dot Chart

 
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  #1  
Old 12-19-2003, 07:54 AM
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Location: Pilot Butte, Sask., Canada
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Mil Dot Chart

I have a springfield 6-20 scope on a 22-250, 50 grn Nosler BT at 3647. Question is if it shoots dead on a 100 yds. First mildot at 100 shoots 4 in high. Would it be safe to say it will shoot dead on at about 340 yds. What would next mil dot shoot at and so on.
[img]images/icons/confused.gif[/img]
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  #2  
Old 12-19-2003, 08:11 AM
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Re: Mil Dot Chart

Calibrated MilDots are 3.6 inches apart at 100 yards (3.44 MOA)

If your 22-250 shoots dead-on at 100 yards at the crosshair and 4 inches high on the first MilDot there is a measurement problem I believe.

You can run a ballistic chart for 3.44 MOA intervals and get the "distance" zero from that... best to actually shoot and see where they hit.


You don't state environmentals so I used "standard" and a scope height of 1.75"

50 Nosler .238 BC

Zero plus 3.6 high (first MilDot) = 3.6 high at 100 yards and .5 low at 350 yards

Zero plus 7.2 high (second MilDot) = 7.2 high at 100 yards and .3 inches low at 475 yards

Zero plus 10.6 high (third MilDot) = 10.8 high at 100 yards and 1.3 inches low at 575 yards.

You can run the numbers using the JBM ballistic website same as me for the rest.
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  #3  
Old 12-22-2003, 08:48 PM
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Re: Mil Dot Chart

sounds like what Dave is saying is that your scope will pretty much be dead on at 340y using the first mildot below the crosshair intersection. [img]images/icons/smile.gif[/img]

Keep in mind that adjustting the scope magnfication might change the relative mildot spacing, unless the reticle changes size w/the magnfication.

Try putting two heavy pointed lines (felt marker type) precisely 3.6" apart on a target at 100y. Peek thru your scope and two adjacent mildots should be centered on the marks at 'standard' mildot spacing. Crank the magnfication until everything lines up, and there you go. Let's say this is at 20x on your scope. You could then fairly safely assume that dialing down to 10x would result in the mildots equating to 7.2" spacing (between adjacent dots).

[ 12-22-2003: Message edited by: Nate Haler ]
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  #4  
Old 12-23-2003, 08:57 AM
700 700 is offline
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Re: Mil Dot Chart

Da Grizz

I just emailed you some drop charts (inches and milliradians)and a drop table.

I assumed standard athmospheric conditions and scope height of 1.7 inches and 100 yard zero.

With those assumptions, 1 milliradian holdover will put your bullet on the mark at 340 yards.

Regards

700
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  #5  
Old 12-23-2003, 03:20 PM
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Join Date: Jun 2001
Location: Palmer, Alaska
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Re: Mil Dot Chart

Da Grizz and Nate,

The SA scope line has the reticle in the 1st focal plane, so mildots spacing from center to center will remain 3.6" (3.44 MOA) at any power setting.

You might have a look at the Exbal ballistic program. It has a ballistic reticle analysis section, and once you enter your load, reticles vertical tic spacing (mildots, Custom BDC, NP-R2, etc) and "point blank target height" (+ or -2", 3", 4", etc, from POA, it will tell you the near and far zero range for each tic on the scope, and its actual zero range. Very cool program.

The new PALM version of Exbal now has a range estimation calculator for use with the R2 or Mildot (right on!), and it's own maximum point blank range calculator too. The MPBR calculator tells you how high or low the shot will be if using a specific tic mark for the range you enter, works slightly different than the desktop Exbal program, it is very usefull.

Ric,
You should get the new updated Exbal programs too, well worth the $13 to update. You'll love the new layout, links and features. I had mine two days after ordering it over the web, and thanks to John M. for pointing out they were available!!! Gerald's site didn't show the new screen views for the programs, just the older version. http://www.perry-systems.com

The new PDA software is a real nice improvement, also includes an actual drop chart link on the firing solution window... way cool.
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  #6  
Old 02-23-2004, 08:55 PM
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Join Date: Jan 2002
Location: Alaska
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Re: Mil Dot Chart

I just upgraded Exbal for my Palm Tungsten T3. Version 4.2 is out now. It has several new features, like bullet lookup screens. Upgrade is now $17.50, but still a bargain. I think the program is just plain awesome.
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  #7  
Old 02-24-2004, 12:11 AM
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Re: Mil Dot Chart

My program lets you do this:


It also lets you do it in NF NP-R2 and a few more popular ones. Just enter in your drops and zero, the diagram does the rest.
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