and if you absolutely , positively , must have a laser bore sighter, get one in green, not red. Red is nearly invisible in daylight. You'll have to do your bore-sighting in low light conditions so you can see the red dot. I have one of the cartridge laser boresighters, and don't ever use it now. Pain in the arse if you ask me. I have 2 other boresighters, one with arbors for each caliber class, and I even have the magnetic one that sticks on the end of the barrel. I only use these on guns that I can't look down the bore of and sight it in the original way, such as my Remington 7600 pump, and some of my semi-automatics.
If you have a bolt, just set the gun in a steady rest, remove the bolt, LOOK down the bore and find an object in the center of the sight picture, and without moving the rifle at all, adjust the scope reticles to meet up with the "object" at the center of your sight picture when you looked down the barrel. This will get you "On target" as well or better than a bore sighter. They are not the be-all, end-all manufacturers seem to say they are.