Re: How many here use a Mill Dot Recticle in your scope to judge range?
A couple of things here...
I use a mildot, almost exclusively, and a mildot master, and they are great. The calculator is more accurate if you start shooting deer over 800, or prarie dogs over 500 yards, you will need the extra precision of the calculator for first round hits, but the mildot calculator is really nice, and has several features beside distance that it does for you.
You said your ballistic program told you to adjust 47 clicks, then you divided that by 4 to get 11.75? Why the division? Look to make sure, but your program is probably set up for 1/4 MOA adjustments, but has a spot you can change that. Most have the ability to change scope height and MOA adjustments of your scope.
Also, be sure you check you mildot setting. If the mildot reticle is etched on the front glass, it will be accurate, as correct mildots at any zoom setting, but the downside is the reticle also zooms (gets thicker/heavier) as you zoom in. If it is not etched on the glass, there is ONE power setting - usually 10x, but not always - that the mildots are the correct measurement. Anything else and they will not be accurate. The further from that setting, the more off it will be. If it is 10, and your set at 20, it will about two mills differnt at 100 yards. The dial will sometimes have a mark on it, at the correct setting, but read your instructions to be sure, because it is not always marked correctly - as with one of my son's scopes).
Also, stop thinking in clicks and start thinking in MOA, or you will lose your mind as you stretch your distances.
And keep in mind your drop chart from the computer will not be accurate if atmospheric conditions change. A 20 degree temp drop (from 70 degrees the day you zero to 50 degrees the day you hunt) will cause about 1 MOA bullet drop. Elevation, temp, humidity, they all goof with that drop chart. When you are at the range, keep good notes on the conditions, so as you keep shooting the rifle over time, you will learn what effect these things have on your rifle/load combo.
Finally, do some research before getting a range finder. The distances you mention are not reachable by most rangefinders on deer sized targets, and not even close on prarie dogs. Before spending the money, save up for one that will reach the distance you want, on the target you want. I think there might be an article about that very thing on this website.