Bushnell 743333 Professional Bore Sighter Instruction Manual
- June 13, 2024
- Bushnell
Table of Contents
Instruction
Manual Professional
BORE SIGHTER
Model # 743333
743333 Professional Bore Sighter
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.
Professional Boresighter Kit
Model# 743333
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 (Fig. 1/2: A) 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 (Fig. 1/2: B) 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: A), push inward to retract the tips, and pull the unit
from the barrel.
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 grid below)
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.
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.
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.
Optional Accessory Arbors (available through your Bushnell
dealer):
Note that the unique expandable arbors included with the Professional
Boresighter Kit provide exceptional flexibility that is ideal for most owners
of multiple firearms. With only three arbors, the user can bore sight a wide
range- from .22 to .45 caliber.
15 Arbor Deluxe Kit (Model # 744001)
Gunsmith quality with 15 assorted arbors for total versatility
Arbors include: .177, .22, 6mm, .25, 6.5mm, .27, 7mm, .30, .32, .338, .35,
.375, .44, .45, and .50
.50 Caliber to 12 Gauge Expandable
Arbor (Model # 740012)
Just the accessory for the shotgunner or muzzleloader shooter. Fits
Professional and Deluxe boresighters.
Bushnell Outdoor Products
9200 Cody, Overland Park, Kansas 66214
800-423-3537 •
www.bushnell.com
©2013 Bushnell Outdoor Products
Model #: 743333
Lit #: 98-1200 / 09-13
References
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