What do these abbreviations mean and which is best?
MOA stands for minute of angle MIL stands for milliradian. Me myself I like MOA but there are never ending arguments about which one is best believe me!
Thank you for your reply. Can you tell me what there purpose is and why you prefer MOA?
There's a lot to learn about MOA and Mil. You might find watching a few videos on the topic more helpful than a forum reply, but here's the short & sweet version:
1 MOA is 1/60th of a degree, and it turns out that that amount of angular measurement is really close to 1" at 100 yards distance. So making a 1MOA adjustment at 100 yards moves your point of impact just about exactly one inch; making a 1MOA adjustment at 300 yards adjusts your point of impact just about exactly three inches. MOA is a very good system of measurement if you naturally think in inches / feet / yards.
One milliradian is one thousandth of a radian. What's a radian? It's an angular measurement, and there are 2*pi radians in a complete circle. One mil by definition subtends ("draws", basically) an arc of 10 centimeters at a distance of 100 meters. That's exact; no rounding at all. So a 1 mil adjustment at 100 meters moves your point of impact exactly 10 cm; at 300 meters that same 1 mil adjustment would move your point of impact 30 cm. Mil is a very good system of measurement if you naturally think in meters.
They are neither of them better than the other, inherently. They are just ways to measure tiny changes in where something is pointing. Whichever sounds better to you is the one you should probably learn on, but eventually you'll probably use both.
Very informative, thank you.
I found that very helpful and understandable, many thanks.