As a rough explanation/demonstration of how it works.
If your rifle is zeroed for 100m and you see a deer at 250m, you line up on the deer and take your shot. When the .308 bullet arrives at the deer, it will have dropped about 25cm or more.
To account for the above, you can aim 25cm higher than where you want to hit (this is easy if the deer has a ruler taped to it but you won't see many deer that have this), or you can dial up, which is basically adjusting your sights on the fly for that particular shot.
to come up 25cm at 250m you need to come up 1MRAD/Mil (about 3.5MOA in the old money), if you scope clicks equal 0.1MRADs/Mil, then you dial up 10 clicks to be able to point and shoot with no hold over.
In theory just about all scopes can do this, but the ones with clicks work better, and the ones where you don't have to undo the turret caps potentially loosing them, work better again.
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