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I have been going through my shooting notes and found some of the notes I keep regarding range estimation. I personally don't have the luxury of a Mil-Dot reticule, just a standard Duplex reticule, however this can be used for rough estimation of range as follows.

The Duplex reticule makes use of a fine cross in the centre of the scope with thicker lines at the edge
http://www.outdooropticshop.com/store-products-Scopes-Reticle--Styles-Scopes-Reticle-Styles_7211678.html

The reticule is described as a 30/30 reticule, and at 3x the small cross of the reticule covers an area of approximatly 45inches at 100yrds (an m16 is 39in)

at x4 the small cross covers 30inches at 100yards which is approximatly the size of an M4

so for example if at x4 an m4 rifle fills half the small cross the target is 200yards away or if only half the rifle can fit into the reticule the target is 50yards away.

Hope this helps
 

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Good information! (I felt bad leaving this post neglected) I remember looking for a 3-4x mil dot in my price range for my ASR and ended up having to go with a 30/30 due to funds. Still a nice scope, but it would have been nice to have the ranging of a mil dot, but hopefully this will help a bit!

PS have some carma.
 

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I'd like to add a way that might help some people with range estamation.
Only works if you have a manual focus on your scope. And this only really works with airsofting ranges(100yds or less)
So say your looking at a target at an un-designated distance, if you have a manual focus on your scope set it at the lowest lvl, most likely it will be out of focus, keep adjusting your wheel until the object comes into focus. Thus you will know aprox. what range the target is from you because of the markings on your focus wheel when it comes into focus.

Now I havn't actually tested this so its all thearetical.
 
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