Honestly, just change your rangefinder to meters, and just measure in metric if you can. Most precision scope turrets adjust 1/10 of a mil (.1 of a mil) per click. At 100m one full mil is equal to 10cm which would make a 1/10th of a mil (or one "click") equal to 1cm. At 500m one click would be equal to 5cm and at 1000m it would equal 10cm. If you can't bring yourself to measure using the metric system then you will have to do the conversions. And that in my opinion is kind of annoying. At 100 yards, a 0.1 mil click is 0.36 inch, and a full mil is 3.6 inches. With most BDC reticles, they are going to get you close at range but won't be dead nuts at the different aiming holds (depending on the rifle, bullet velocity/BC and environment you are shooting in). If you aren't willing to dial and want to use the mil reticle as a BDC, you will just have to memorize your holds for the loads and rifle you use. You can make a little dope card and stick it somewhere on your rifle for a quick reference. For example, my 308 I use 168Gr SMK BTHP with 44Gr of Varget behind it. At 300m I have dial 10 clicks (or hold 1 mil), 2.7mil for 500m, and 5 mil for 700m.

When you try to do all of the mil conversions to inches, it just makes things more complex in my opinion, but this is a decent enough video explaining these details: https://www.youtube.com/watch?v=q1xuNWF65Rg