What easy "in the head" math is there for ranging in mils?
I have read a few different publications that have different methods, but one way I've come up with (I guess it all depends on how accurate you need to be) is to take the number of inches that one mil covers on the target divided by 4 + 10% = yards in hundreds (this is based on one milrad equaling 3.6" at 100 yards).
For example, a fence post is near the target and you know the fence post is about 4' out of the ground. If one mil covers 1/2 the post, that is 24". 24 / 4 = 6 + 10% (easy calc to account for the 4 being about 10% over the 3.6" mil coverage at 100 yd) = 6.6 or 660 yards (6.6x100).
That's about as easy as I've been able to make it in my mind, but it depends on knowing the height or width or the target or something near it. I've found it's sometimes easier to halve the inches twice if you get an odd number (half of 24 is 12 and half of 12 is 6 + 10%).
Is there any easier way?
I have read a few different publications that have different methods, but one way I've come up with (I guess it all depends on how accurate you need to be) is to take the number of inches that one mil covers on the target divided by 4 + 10% = yards in hundreds (this is based on one milrad equaling 3.6" at 100 yards).
For example, a fence post is near the target and you know the fence post is about 4' out of the ground. If one mil covers 1/2 the post, that is 24". 24 / 4 = 6 + 10% (easy calc to account for the 4 being about 10% over the 3.6" mil coverage at 100 yd) = 6.6 or 660 yards (6.6x100).
That's about as easy as I've been able to make it in my mind, but it depends on knowing the height or width or the target or something near it. I've found it's sometimes easier to halve the inches twice if you get an odd number (half of 24 is 12 and half of 12 is 6 + 10%).
Is there any easier way?