How to use adjustable objective rifle scopes<br>Be sure that your scope is mounted properly. Sighting-in can have been done preliminarily, but additional sighting-in will be desirable after following these steps : Know your rifle. There are actually two optical systems in a rifle scope.
Objective rifle scopes are more accurate than open sights. 
( z1 accurate :ARG2-of ( z2 have-degree :ARG1 ( z3 scope :mod ( z4 rifle ) :mod ( z5 objective ) ) :ARG3 ( z6 more ) :ARG4 ( z7 sight :ARG1-of ( z8 open ) ) ) )