Mildot Hold off using scope set on 20 power question???????

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Rotac

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So from what I understand, Mildot estimation for hold off and ranging etc. is normally done with your scope set on 10 power. (Am I correct on this? It's been awhile since I've done any Mildot training)

I have an older Vortex Viper 6.5 x 20 power scope on a custom Rem 700. (This is not a front focal plane scope). I want to use it on the 20 power setting and use my My mildot reticle for come ups instead of making sight elevation adjustments with the turret out to 500 yards. This is for fast shooting where time is important. (Meaford Precision Rifle Steel Challenge)

The Hornady Ballistic Calculator advised that the Mildot come ups for my rifle and load are: 200 yards-0.5 Mils / 300 yards-1.2 Mils / 400 yards-2.1 Mils / 500 yards-3 Mils.

So my question is with the scope on 20 power do I cut the Mils in half because I've doubled the magnification? Am I in the ball park on this or way off the mark?

Any assistance would be appreciated...
 
This might help, & they can say it better than me;

First Focal Plane vs. Second Focal Plane:

Rifle scopes generally come in two varieties. The most common is the Second Focal Plane reticle. In this type the reticle covers more or less of the target depending on the magnification setting of the scope. If you are looking at a target through the rifle scope and you turn the power selector ring the reticle will appear to stay the same size as the target zooms larger. This causes a couple of problems. The first being that the reticle will only be accurate for ranging at one power setting. The second is that the reticle will only be correct for holds at one power setting.
Click to expand...


http://8541tactical.com/range_estimation.php
 
Yes, to figure out hold overs at different power settings, take the setting that the mils are true at and divide by the current setting on the scope (10÷20=.5). Most sfp scopes have a mark where the power is calibrated for the mil dots, one I have has the 10 on the power ring in red. Google is your friend for more info on your scope. Not sure if this is universal, but for my scope I found some other helpful info. The cross hair post width is .1 mil, distance between dots .8 mil, dot dia .2 mil, centre of post to bottom of dot .9 mil. Good luck!
 
It is not universal , varies with manufacturers.

It is an easy test , set up a tape measure at 100 yards.Manipulate the power setting until one mil is 3.6" , or get a 36" stick put at 1,000 yards, do the same (this will be slightly more accurate).
 
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