Re: how do you know you can shoot xxx yards?
By all means shoot from a bench to sight your rifle in, you have to be certain of where it is sighted in for. Test where it is hitting at 100 200 300 etc . ( If you don't have a chronograph.) Use your rangefinder and shoot at various ranges to test poi. All from the bench. Practice with a .22 to better your shooting form and method.
shoot shoot shoot.
it not only beneficial , its fun!!!!
B.
Grandpa used to say, "ya know, when you point your finger at someone , three of your fingers are pointed back at you."