Quote:
Originally Posted by Big Z
Don't waste your money on one 
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+2, unless you have a lot of semi-autos that don't allow you to look down the barrel from the breech end (like the BAR or Rem 7400/750 series rifles). If you can remove the bolt and look down the barrel, then the best tool you can use is your own eye. Set the rifle in a steady rest (like a bipod with a rear bag, rifle vise, etc...) and then, looking down the bore, center the bore on an object that it 50-100 yards away as best as you can. Then look through the scope and see where the object you centered the bore on is in the scope. Adjust the crosshairs so that they are also centered on the object. Repeat the process until the crosshairs and bore align with each other. Now go to the range and place an 8.5x11" target at 25 yards and carefully fire one shot. If you did the procedure correctly, you will be on the target and pretty close to the center of the bull (I'm usually less than 1" from center, usually low). Adjust the scope to move the strike of the bullet as close to dead center as possible and fire again. If the bullet hits less than 1" of dead center, move the target to 100 yards and proceed with sight-in there. If not, adjust the scope and fire again. No need to fire groups at 25 yards. Just carefully shoot once and adjust. If the scope is decent (ie it holds zero and tracks properly) and mounted properly, I've never needed more than 3 shots at 25 yards to get on on the bull.
If you follow my procedure carefully, the cost is 15 minutes of your time and 1-3 rounds of ammo to get closer than any boresighter will.
Mike