BOSS NEW
THE BEST THERE IS™
BOSS
OWNER’S MANUAL
®
SWEET SPOT CHARTS FOR YOUR
BOSS®-EQUIPPED RIFLE ARE
AVAILABLE AT BROWNING.COM
OR CALL:
1-800-333-3288
BOSS®OWNER’S MANUAL
(BALLISTIC OPTIMIZING SHOOTING SYSTEM)
Very important: Save this booklet. Carefully read this entire
owner’s manual before using your new Browning firearm.
New Gun Owner’s Record
Keep this record for future reference:
Browning Model __________________________________
Serial Number __________________________________
Gauge / Caliber __________________________________
Purchase Price __________________________________
Purchased From __________________________________
Date of Purchase __________________________________
YOU ARE RESPONSIBLE FOR FIREARMS SAFETY
These are additional instructions specific to the BOSS® installed on
your new A-Bolt or BAR rifle. You must read and understand the
cautions and proper handling procedures outlined in this booklet and
in the owner’s manual received with your rifle before using your new
BOSS®-equipped rifle. If you are missing the owner’s manual for your
rifle, we will send you a free replacement manual upon request.You
can also visit our website at browning.com as many of our owner’s
manuals are posted on line.
CAUTION: THE THREADING ON YOUR BARREL IS FOR BROWNING BOSS
COMPONENTS ONLY. DO NOT INSTALL ANY OTHER DEVICE ONTO THE
BROWNING BOSS
RIFLE, WHICH IS NOT DESIGNED AND FITTED FOR THE BOSS
®
BARREL. DO NOT INSTALL THE BOSS®DEVICE ON ANY
®
BY
BROWNING. DOING SO MAY CAUSE SERIOUS INJURY OR DEATH TO
YOURSELF OR OTHERS.
GENERAL OPERATION
The BOSS® (Ballistic Optimizing Shooting System) allows you to fine
tune accuracy by modifying the vibrations of your rifle’s barrel using
an adjustable weight system.
Every time a rifle is fired, barrel vibrations are set in motion. These
vibrations occur in all directions, even back and forth along the axis of
the barrel. Browning research has confirmed that barrel vibrations are
the primary cause of inaccuracy. Barrel vibrations are influenced by
many factors such as bullet type, bullet weight, primers, different
powders and barrel configurations.
The BOSS® adjusts timing of barrel vibrations so the bullet
consistently leaves the rifle muzzle at the most advantageous time.
Once the BOSS® is adjusted to this “Sweet Spot” for a given
ammunition, your rifle will consistently deliver extraordinarily tight
groups. With precision ammunition, BOSS®-equipped rifles of many
calibers are capable of 100 yard, one hole groups. The smallest 3-shot
group obtained during the BOSS® development measured an
incredible .051" at 100 yards, using factory loaded ammunition. No
2
®
FIGURE 1 FIGURE 1A
Micro Adjustable
Lockout
Body
Micro Adjustable
Lockout
Body
Micrometer Adjustment Ring
Micrometer Adjustment Ring
longer will you need to try a variety of ammunition to obtain
acceptable accuracy. With the BOSS®, you can tune your rifle to get
the optimum accuracy for all available factory loads.
When adjusted to its Sweet Spot, the BOSS® will compensate for slight
deviations in ammunition velocity. However, the BOSS® will not
compensate for poor shooting or flyers caused by low quality bullets
and ammunition.
TO OBTAIN THE HIGHEST LEVEL OF ACCURACY FROM YOUR RIFLE, IT IS
RECOMMENDED THAT THE RIFLE BORE BE CLEANED AFTER EVERY 12 TO 15
ROUNDS. SEE "CLEANING THE RIFLE BORE" SECTION OF THIS BOOKLET
FOR CLEANING PROCEDURES.
MUZZLE BRAKE FEATURE
The BOSS® is available in two versions, the muzzle break version
(Figure 1) and the CR (conventional recoil) version (Figure 1A).
WARNING: THE BOSS®WITH RECOIL REDUCING MUZZLE BRAKE PROVIDES
SUBSTANTIAL INCREASED NOISE/MUZZLE BLAST. ALWAYS WEAR HEARING
PROTECTION TO PREVENT HEARING LOSS OR DAMAGE.
The unique exhaust hole pattern on the BOSS® with muzzle brake
provides considerable recoil reduction. Recoil reduction of the BOSS®
ranges from 30% to 50% - depending on caliber, weight of rifle, etc.
You will experience an increase in noise and concussion (muzzle blast)
when a BOSS®-equipped rifle is fired. Hearing protectors (shooting
ear plugs or muffs) should always be worn to guard against hearing
damage when shooting a BOSS®-equipped rifle. Wear shooting glasses
3
to protect your eyes from flying particles. Always keep a safe distance
between the muzzle of your firearm and any persons nearby, as
muzzle blast, debris and ejecting shells could inflict serious injury.
BOSS®SPECIFICATIONS
The BOSS® body length is 2" for all calibers. The size of the gas vent
holes and hole pattern is the same for all calibers. The size of the
bullet exit hole is the same for all calibers except for the 338 Win.
Mag. and 375 H&H. The thread system for the 338 Win. Mag. and the
375 H&H is different from other calibers to rule out the possibility of
accidentally switching components and creating an unsafe
combination. Do not attempt to interchange these systems. Use only
the BOSS intended for use with your rifle.
Each BOSS® consists of a micro-adjustable lock nut and body
(Figure 1). The body of the BOSS® consists of a weight and muzzle
brake. The weight and muzzle brake are affixed by LOCTITE®. The
micro-adjustable lock nut has a micrometer adjustment ring.
To obtain the utmost accuracy from your BOSS®-equipped rifle, it is very
important that the micro-adjustable lock nut and body are always tight.
THE “SWEET SPOT”
Precision accuracy from the BOSS® system is achieved by calibrating
your rifle caliber and ammunition with a prescribed Sweet Spot
setting. (The Sweet Spot chart is available separately from this manual.
If you do not have a Sweet Spot chart, call 1-800-333-3288 to request
one. You can also look up this information at browning.com) This
chart lists average, or suggested, Sweet Spots. These settings were
determined through extensive testing by the Browning research and
development staff. Sweet Spots may vary between rifles of identical
specifications with given ammunition. Even one quarter of a turn
away from the Sweet Spot can cause a group to spread out as much as
one inch or more. We suggest you use our listed Sweet Spot settings as
a starting point in determining the exact Sweet Spot setting for your
particular rifle and make changes accordingly.
THE BOSS
4
®
SETTING MAY SLIGHTLY ALTER YOUR RIFLE’S POINT OF IMPACT.
NOTE: ANY CHANGE IN
FIGURE 2 FIGURE 2A
Calibrate the BOSS®so ”0“ lines up with the
hatch mark on the barrel.
The micro-adjustable lock nut must be bottomed out.
It is recommended you set the BOSS® Sweet Spot setting before sighting
in your rifle for windage and elevation. The BOSS® was tested in full
1
⁄2 and 1⁄4 turn increments. Tighter groups may be achieved with
turn,
the BOSS® tested in other positions. On the Sweet Spot chart, Sweet
Spots are listed by both ammunition and rifle model. Settings not listed,
either do not apply or are for ammunition not yet tested.
PRELIMINARY ADJUSTMENTS
Before setting your Sweet Spot, it is important that your BOSS® be
calibrated with the barrel. This will ensure that your rifle is consistent
with those tested by Browning research and development when
BOSS® Sweet Spots were initially determined.
To find out if your BOSS® needs to be recalibrated, loosen the microadjustable lock nut and turn it until it bottoms out on the threads of
the BOSS® – or will not loosen any further. If your BOSS® is
calibrated, the “0” on the micrometer adjustment ring will line up
with the longitudinal hatch mark on the barrel (Figure 2). If the “0” is
not aligned with the longitudinal hatch mark, you will need to
calibrate your BOSS®. Move the micrometer adjustment ring on the
bottom of the micro-adjustable lock nut so the “0” is aligned with the
longitudinal hatch mark. To adjust the micrometer adjustment ring,
insert your fingernail or a small pointed object in the split of the ring
and rotate the ring (Figure 3).
5
Loading...