How to use a mil/mil scope-reticle, turrets and proper usage

[benconfused]

RULE OF THUMB — USING MIL-TENTHS
Deer

Range (yards) ≈ 45 ÷ (mil-tenths)
(Example: 3.2 mil = 32 tenths → 45/3.2 ≈ 140 yards)

Bear

Range (yards) ≈ 55 ÷ (mil-tenths)

Elk

Range (yards) ≈ 75 ÷ (mil-tenths)

Why these numbers work

They come from:

Deer chest ≈ 18"

Bear chest ≈ 22"

Elk chest ≈ 30"

Range (yards) ≈ 25 × chest(in) ÷ mils
Converting to tenths just divides by 10, giving the simple constants (45, 55, 75).

The final version you can memorize in 5 seconds

Deer: 45 ÷ mil-tenths
Bear: 55 ÷ mil-tenths
Elk: 75 ÷ mil-tenths

Or using mils

Deer: 450 ÷ mils
Bear: 550 ÷ mils
Elk: 750 ÷ mils

Digesting this for a moment (I'm slow sorry). For your example: "(Example: 3.2 mil = 32 tenths → 45/3.2 ≈ 140 yards)" --- 3.2 mils is using your reticle to measure from what to what on the deer, hoof to top of back?

 

[RockAndSage]

I know what I'll be studying and working on this weekend...

 

[Mike Islander]

Digesting this for a moment (I'm slow sorry). For your example: "(Example: 3.2 mil = 32 tenths → 45/3.2 ≈ 140 yards)" --- 3.2 mils is using your reticle to measure from what to what on the deer, hoof to top of back?

Chest measurement in 0.1 mil steps.
CORRECTED TO BE MORE ACCURATE AND EASIER MATH Divide 50, 60, 80 by those measured 0.1 mil steps. Equals range in hundreds of yards.

Also just do this:
500/mils = yards for deer
609/mils = yards for bear
800s/mils = yards for elk
Rules of thumb, not exact. But close enough and easy to remember.

General formula?
Range (yards) ≈ 27.8 × target height (inches) ÷ mils