Instruction
Manual
Professional
BORE SIGHTER
Model # 743333
The Bushnell Professional Boresighter is an essential tool for quickly adjusting scope
or iron sights to align with the rifle or handgun barrel. Correct use of your Boresighter
will put sighting-in test shots “on the paper”, requiring only minor expenditure of time
and ammunition by test firing to achieve pin-point zero at a given distance. Because of
the many variables involved in both ammunition and the firearm itself, final “sighting
in” must be done by actual firing.
After “sighting in” by firing, reinstall the Boresighter in the muzzle of your gun and
note the position of your scope reticle on the grid of the Boresighter. Make a record
of this position for later use in checking the sighting in the field. Be sure to note the
ammunition that was used.
On the hunt, the Boresighter is an invaluable aid for making sure that your rifle remains
accurately sighted when test shots would frighten the game for miles around! In the
shop it is ideal for checking stock bedding for sensitivity to barrel pressure.
SPECIFICATIONS
Graduated Grid Sighting Reticle-each
graduation is equivalent to 4 inches at
100 yards.
Diameter of Front Lens 1-1/2 inches
Length of Body
Weight
4-7/8 inches
6-1/2 ounces
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HOW TO INSERT THE EXPANDABLE ARBOR INTO THE GUN BARREL
Place the gun with mounted scope into a suitable support. Select the proper arbor and
make sure the expandable tips are completely closed by turning the arbor’s locking
nut (“A” Fig. 1,2) counter-clockwise until the tips contract. Insert the small end of
the arbor into the Boresighter mount with the flat area down, so that the end of the
clamp screw (“B” Fig. 1) will bear against the flat surface. Turn the screw clockwise
until it is fingertight. Now, with the Boresighter in an upright position, insert the arbor
into the barrel and push it forward carefully until the muzzle rests against the tapered
section of the arbor (Fig. 2). With the arbor locking nut loosened, and while looking
through the scope, swing the Boresighter to align vertical grid lines with the scope
reticle. Turn the arbor locking nut clockwise until the arbor holds firmly to the bore;
the expandable tips prevent the Boresighter from turning of its own weight.
NOTE: To remove the arbor from the barrel, simply loosen the arbor locking nut
(Fig. 1), push inward to retract the tips, and pull the unit from the barrel.
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HOW TO BORE SIGHT A SCOPE-MOUNTED RIFLE OR HANDGUN
Scope/Rifle Combination
Once you have secured the Boresighter, place the rifle on a suitable support. Remove
the adjustment caps from your riflescope. Then sight through the riflescope and align
the reticle with the crosshairs of the graduated grid reticle in the Boresighter by using
the riflescope’s elevation and windage adjustments. Once you have aligned the
riflescope reticle with the graduated grid reticle in the Boresighter, you are ready for
sighting-in on the range. If bore sighting has been done properly, sighting-in should
take a minimum of time and ammunition. After “sighting-in”, don’t forget to reinstall
the Boresighter and record the reticle position (see pg. 1).
Scope/Handgun Combination
Once you have secured the Boresighter to the barrel, place the handgun on a suitable
support. Remove the adjustment caps from the scope. Sight through the scope and
align the crosshairs with the crosshairs in the Boresighter using the scope’s elevation
and windage adjustments. Once you have aligned the scope crosshairs with those of
the Boresighter, your handgun is ready for sighting-in on the range.
How to Bore Sight a Rifle or Handgun with Iron Sights
Once you have secured the Boresighter to the barrel, place the handgun or rifle on a
suitable support. Viewing through the rear sight, adjust the sights to align with the
crosshairs on the graduated grid reticle in the Boresighter. When you have completed
bore sighting, the handgun or rifle is ready for sighting-in on the range.
How to Make Corrections for Bullet Drop
Using the scope adjustments, you can make correction for bullet drop at a specific
distance provided the trajectory of the specific load is known. Each graduation on
the Boresighter grid is equivalent to 4 inches at 100 yards. When the scope reticle is
below the grid center, the gun will shoot high.
Model #: 743333
Lit #: 98-1200 / 04-08
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