Re: Teleskoop spesifikasie voorkeuse???
Posted: Tue Sep 08, 2015 5:41 pm
The Mil system was originally adopted in the current NATO form by the French as an alternate to decigrades as the primary unit of measure to sight field artillery shortly after World War I. It was shortly after that time that the United States adopted it for the same purpose. The push for a standardized unit of measure among NATO forces lead the charge during this time period and is the primary reason for adoption of the metric system by the United States military and allied forces. With this being the case, it is often thought that the angular mil is a metric measurement. This is a false but understandable assumption considering the consequential linear associations, as you will see in a moment. While it may be insignificant, it holds true that the mil system is not metric, nor imperial, but an angular unit of measure just as MOA and IPHY.
One mil is 1/6400th of a circle. Just as with the MOA system, which is broken down from 360 degrees of a circle, the mil system is based on 6400 mils in a complete circle. The actual number of mils in a circle can be somewhat confusing due to the fact that different countries claim different numbers. NATO countries recognize that there are 6400 mils in a circle. The actual trigonometric measurement calls for 6283 mils in a circle. Non-NATO countries have even different interpretations. It is up to you which interpretation you want to adopt, but personally, I will side with the U.S. military! Thus, for our purposes we will contend that there are 6400 mils in a circle.
The linear distance covered by one mil is identical in its behavior to MOA and IPHY in that it increases as the distance to the target increases. In the illustration below, you can see that one mil covers 3.6" at 100yds and 7.2" at 200yds. This behavior is true of all angular units of measure.
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As you can see, one mil covers more than three times the linear distance than one MOA does. This results in much smaller mil numbers to gain an equal adjustment that a larger MOA number provides. For instance, we discussed that for a typical short-barreled 308win to reach 1000yds that approximately 42 MOA of adjustment would be required when using 175gr bullets. To reach that same distance with an identical trajectory would take 12.2 mils of adjustment. These numbers are simply estimates to show the differences between the two units. Real world drop will be different for every load and rifle combination, so proper application of a ballistic computer should be employed to get your exact drop. We will cover ballistic computers in a future article on Primal Rights.
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Optics manufacturers seem to be much more standardized when it comes to the mil system when compared to MOA. Typically, most mil-based rifle scopes are set up with 1/10th click turrets. This means for every click of the turret you will adjust for 0.1 or one tenth of a mil. This translates to a linear difference of 0.36" at 100yds or about 1/3 of an inch. This is slightly more coarse than the 0.25" typical adjustment of MOA turrets and vastly more coarse than 1/8 MOA clicks. That being said, I have not encountered a single situation in a match, hunting, pounding steel, or target shooting where the 0.1 mil clicks were not precise enough to make the adjustment required to hit the target. One click at 1000yds translates into a 3.6" linear adjustment. That is pretty small.
The reticles offered by most companies are also somewhat standardized. The various different mil reticles carry different names for the type of reticle they represent, as well as specific names given to them by their manufacturers. The original mil-dot reticle is as you see below. The measurements of the reticle are what is referred to as "sub-tensions" which is simply a description of how the reticle is laid out. You can see that the dots cover a 0.2 mil area, and there is a 0.8 mil space between each dot. This style of reticle is referred to as a standard mil-dot.
