josebd,
Use an object of known size at a known distance to determine the ratio, then use the ratio to estimate the distance by using an object that you have a good handle on the size. Measure a paper plate and find out the distance it takes to fill the diamond. That will give you a ratio. Then if you are hunting coyote, a coyote stands about X tall and its chest is about Y deep. This may allow you to estimate the Range.
On my mil-dot, each dot spans 3.6" at 100 yards when the scope is set at 12 power. If a coyote's chest is 12" from top to bottom, and there are 2 dots covering it at 12 power, then he is about 160 yards away, (mental math: 12 divided by 7.2(3.6x2) is more than 1.5 and less than 2)
The instructions might give you some details on the ratio of the reticle. My mil-dot scope came with some details. The Smart Reticle is similar, but only has 4 divides instead of the five on my scope.
You might also check the simmons website.
www.simmonsoptics.comNeal