Until fairly recendy, most scope windage and elevation adjustments were accomplished on plates held in place by friction. Spring resistance to rotation was all that maintained your zero; if you wanted to record that zero, you could be no more precise than merely noting where a plate's indicator lines were set. This meant you couldn't be very precise at all.
Many quality scopes have replaced simple friction plates with very precise adjustments that audibly "click" with each sub-MOA increment. One click, which you can both hear and feel, moves the reticle an exact and predetermined amount.
There's no guesswork if you understand how to interpret reticle changes and Minutes of Angle, a subject we'll address in depth. But even more importantly, these positive click adjustments are repeatable; you can add 10 clicks of elevation, take a few shots, then come down 10 clicks, and you're back exactly where you started.
The size of these increments, too, has become much more precise. Nearly all the scopes in this book employ 1/4 MOA positive click adjustments, which are twice or even four times more exact than were adjustments in the past. It should be noted that a few of the German and Austrian scopes use 1/3 MOA increments, a product of their metric system.
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