Thread: Mil-Dot reticle help pls clever fellas

OK fellas...

I'm having a real "thick" moment. The mil-dot reticle on a 2.5-15x second focal plane scope I am interested in has the specs shown on the attached image. My understanding is that mil-dot scopes are calibrated at 10x magnification to generate the correct holds on the ballistic solver. Milspec says so (I think) and is kind of backed by the fact that for many years military snipers used fixed 10x scopes. (I'm dredging the dark corners of my memory now so may be wrong.)

So in the image, at 15x power, the distance between two dot centres is 2.27 MOA, so 0.66 mrad. If it was calibrated at 15x, then this value should be 3.44 MOA or 1.00 mrad.

Seeing as how we have the values for 2.5x power, how do I calculate the 10x power value to confirm 10x calibration? I am expecting the distance between two dot centres at 10x power to be 3.44 MOA / 1.0 mrad.

Hope this makes sense. Any help that solves this will be much appreciated.