Originally Posted by martin c
radian's are a measure of angle , as said before and are basically a metric replacement for the old degree's ,minute's and second's system that most people still use .
the mildot is based on this system and has been said in previous posts a factor of 1-1000 is a true mildot
however as most people still use imperial then the midot has been adopted to work within this system also.
so true mildot is purely metric where as if used with yard's or inch's then it can not be a true mildot.
err hope this helps
ps lets not forget that a metre is 3 inches longer than a yard
Mildots aren't purelly metric and it's not true to say "if used with yards or inches then it cannot be a true mildot" - a 3.6 inch object at 100 yards is very very close to being exactly 1 milliradian.
A true trigonometric milliradian is what I take to be a true mildot (actually it's not quite 1:1000, but it's very very very close - a 1m object at 1000m is actually 1.000000333 milli radians - it's the difference between the length of the arc and the length of the straight line)
NATO, the former Soviet Union, Finland and Sweden all used to have slightly different definitions of the measurement of a mildot - none of them were true trigonometric definitions.
But... none of that matters for airgun ranges - any mildot definition will be close enough so long as you know the magnification on your scope where the mildots are "true" - and true can be whatever definition of a mildot you care to run with :- NATO, Trigonometric, Russia/Finland, Sweden