taliv said:
here's an easy question to illustrate using meters/cm vs yards/inches: "How big is a mil at a given distance?"
(as in... i just ranged a target at x meters or yards, so if i hold over 1 mil, how much distance will it move the impact?)
That's an unrealistic example of scope use IMO. If you've ranged a target at X meters or yards, you'd refer to your DOPE to read off the required holdover or come-up for that range. Talking of ranging, here's a more realistic scenario. A target at an unknown distance that you estimate to be 6 ft tall measures right at 1.75 mils in your FFP scope (or SFP on correct magnification). 6' = 2 yards = 1.83m. What's the range to the target?
(Target Height (units)/mils)*1000 = range (units)
(2 yards/1.75 mil.rad)*1000 = 1143 yards
(1.83m/1.75 mil.rad)*1000 = 1045 meters
This is a more realistic use of a ranging reticle and both would most likely require a calculator. It shows that the Imperial System is no more complicated than the Metric System in terms of ranging.
However, another common situation is making POA/POI corrections when target shooting. If you have a mil reticle and mil adjustments, and assuming you can use your reticle (or a mil spotting scope) to measure the distance between the POA and the POI, it's easier to dial in the correction. A mil reticle with MOA adjustments requires an extra step (and probably a calculator) to convert mils to MOA by dividing by 0.29089. To convert mils to MOA "on the fly", multiplying mils by 3 will work fairly well out to 300 yards, and by 3.5 out to 600 yards.
When I'm shooting F-Class targets at 600 yards, if my first sighter is halfway between the 9 and 8 rings at 3 o'clock, I know that I need to come left by 1.25 MOA because I know the X, 10, 9 and 8 rings are 1/2, 1, 2, and 3 MOA respectively. In other words, mil/moa works just fine for F-Class shooting with no calculators required. However, I realize that other disciplines may benefit from mil/mil scopes but I'm not sure what those disciplines are. I would suggest that a mil/moa FFP scope is more useful/practical for most people compared to a SFP mil/mil scope, but that said, I'm seriously considering ordering the NXS 3.5-15x50 F1 with mil/mil adjustments.