Steve and I have discussed the reticle range finding in person before and he is the one that tought me to use it. I have applied it to my Clearidge XP scope on the 243 Striker. It has a subtension of 2.48" at 100 yards on 20X. I usually use the head of the charlie as a target and they are about 4", the size of a softball. So if we use the formula with the head of the woodchuck taking up 2 subtension (distance between the dots) it works out like this;

4 X 100 / 2.48 / 2 = 80 yards away

If the charlies head takes up 1 mil it comes out that he is;

4 X 100 / 2.48 / 1 = 161 yards away

If the charlies head takes up half a mil it comes out that he is;

4 X 100 / 2.48 / .5 = 322 yards away

Sounds complicated but it's not. If you always use the same power and the quarry is constant, like hunting charlies all summer you can have the first part of the equation done and stored in your head or on a piece of paper and all that's left to do is divide the mils into it. For example I will find a charlie on a lower power and then dial the scope up to 20X, so I know that my 4" charlie head is going to be multiplied by 100 which is 400, then divide by 2.48 which is 161 and constant at 20X. Now just divide 161 by the mils his head takes up; example 1/3 or .33 mils is 488 yards. I find if you can break down a mil in 10th it mkaes the math easier. Don't forget your cell phone in your pocket has a calculator in it.

I have taken my range finder along before and checked this and I'm usually with in 20 yards of the reticle. Now a target that's 4" is tougher to determine the mils at longer ranges and a 15" deer, it will make it easier and a little more percise.

Steve if I made it sound to hard tell me.