Never let the guy at the sporting goods counter mount and bore sight your scopes. Leupold bases and rings never gave me a hassle, but you may want to get a 20 MOA rail and rings to match.
+1
You have a nice rifle. So, you might as well do it right.
Get an EGW 20MOA rail and a pair of Burris Xtreme tactical rings.
Mount the base as instructed here:
http://www.longrangehunting.com/forums/f37/securing-bases-73557/
Mount the scope with a comfortable eye relief for your favorite shooting position.
Aim at a blank sky (or cover the objective lens with a white handkerchief) with parallax set to infinity and focus the cross hairs using the diopter and lock it down. Look away, blink, and check it again to be sure. Don't look at the sun.
Place your rifle on the bench with bags firmly supporting it and adjust the parallax such that moving your head side to side or up and down doesn't move the cross hairs on the target.
Remove the bolt and bag the rifle up firmly with the target at 100 yds centered in the bore as you look through the barrel from behind. Move the cross-hairs using the turrets until they too are centered on the target. Check the bore again and then the scope to be sure that the rifle didn't move while you were adjusting it.
When they are both lined up, fire away. Your first shot will get you on paper, and with a good scope, you should be able to correct for the amount of windage and elevation needed to put the second bullet exactly where you want it.
If you put rails on all your rifles, it'll be a cinch to swap scopes and re-zero.
Let us know how the load workup goes.
Happy hunting!!
-- richard