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Posted: 10/19/2004 4:24:42 PM EDT
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I read up on how to use the miliradian dots, and was confused on how to account for different powers of magnification. I think it's: 1 mil = 3.6" @ 100 yd at 10x So what about smaller or higher powers of magnification (i.e. 8x or 14x at 100 yd)? Is it a simple conversion or is there a formula? or does it stay the same? |
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Actually 1 Mil measures more like 3.43" but the USMC rounded it off to 3.6" to make the math easier (10 mils=36in.=3ft., etc.). Some variable scopes are set up to use the mil-dot subtension scale at the highest power. Others are intended to be set at 10X to use the scale. These scopes have the reticle placed in the second focal plane, so it doesn't magnify with power changes so the scope must be set at the magnification specified by its manufacturer in order for the mil-dot spacing to read correctly. Lately, mil-dot reticles are being placed in the first focal plane of the scope which allows the mil-dot spacing to appear the same at any power setting. Naturally, this is better for most users. You need to find out which type of reticle you've got! HTH |
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how do I tell? I looked through my mil-dot scope from the objective lens (so basically you see a small "picture" through the tube..) end of the scope and saw the reticle at the very end (where you look through normally). Does this mean the reticle is in the first focal plane and thus would keep the spacing regardless of the power? |
There are variations on how to do the "radian" portion. The 3.6 inches for mil-radian in the shooting world is as easy as remembering trig functions and that a "radian" is a swing about the arc that is equal to the radius, a "mil" is just 1/1000. There are 3600 inches for 100 yards, a "mil" of that 3600 inches winds up as 3.6 inches which is the value for a "mil-radian" at 100 yards. A "mil-radian" in the military setting can also have a different use for artillery and that's a whole another set of values, people who are artillery oriented seem to cite different values than those who are shooters. |
or you go: 
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Get a Mil-Dot master and you'll be a happy camper. It's wise to know how to do the math to range with mildots if needed, have a calculator and piece of paper as backup but with the mildot master you'll be able to range surprisingly quickly if you can make good mil readings with good estimations of target size. www.mildot.com/ |
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