Browning The BOSS Owner's Manual

bOSS

owner’s manual

®

B O S S® O W N ER ’ S M A N U A L

( BA LLI S TIC OP TIM I ZI NG S HO OTI N G S YST E M)

IMPORTANT: CAREFULLY RE AD THIS E NTIRE OW NER’S MA NUAL
BEFORE USING YOUR NEW B OSS -EqU IPPED BR OWNING R IFLE,
AND S AVE IT FOR FUTUR E REFERE NCE .

Record the following information for future reference:

Browning Model ________________________________

Serial Number __________________________________

Caliber ________________________________________

Purchase Price __________________________________

Purchased From _________________________________

Date of Purchase ________________________________

S W E E T S P O T C H A R T S

Sweet Spot charts for your BOSS-equipped rifle are available at
browning.com or by calling [phone].

Y OU A R E R E S P O N S I B L E FO R F I R E A R M S S A F E T Y

The instructions in this owner’s manual are specific to the BOSS®
System installed on your new A-Bolt or BAR rifle. You must read and
understand the cautions and proper handling procedures outlined in
this owner’s manual, 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
upon request. You can also visit our website at browning.com as many
of our owner’s manuals are posted online.

THE T HREA DING ON T HE BARREL IS F OR BROWNING BOSS COMP ONENTS
ONLY. DO NOT INSTALL ANY OT HER DEVICE ONTO T HE BROWN ING BOSS
BARREL. DO NOT INSTALL THE BO SS DEVICE ON ANY RIFLE WHI CH IS NOT
DESIGNED AND FITT ED FOR TH E BOSS BY BROW NING. DO ING SO MAY
CAUSE SERIOUS INJURY OR DEATH T O YOURSELF OR OTHERS, AND CAUSE
DAMAGE TO YOU R RIFLE.

G E N E R A L O P E RA T I O N

The BOSS (Ballistic Optimizing Shooting System) allows you to
fine-tune for improved 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. Our 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, powders
and barrel configurations. With the BOSS system, no longer will you
need to try a variety of ammunition to obtain acceptable accuracy.
You can quickly and easily tune your rifle to get the optimum accuracy
for all available factory loads by adjusting the BOSS system to modify
barrel vibrations.

The BOSS adjusts the timing of barrel vibrations so the bullet
consistently leaves the rifle’s muzzle at the most advantageous time.

1

FI GUR E 1 FI GUR E 2

Micro-Adjusta ble
Lock Nut

Body

Weight

Micro-Adjusta ble
Lock Nut

Body

The unique exhaust port 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

Micrometer A djustment Ring

BOSS (with muzzle br ake) BOSS-CR (con ventional recoil)

Micrometer A djustment Ring

Once the BOSS is adjusted to this “Sweet Spot” for a given
ammunition, your rifle will consistently deliver extraordinarily
tight groups. In fact, BOSS-equipped rifles in a variety of calibers
are capable of producing 100 yard, one-hole groups with precision
ammunition. The smallest three-shot group obtained during the
BOSS development measured an incredible .051" at 100 yards,
using factory loaded ammunition.

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.

Note: To obtain the highest level of accuracy from your rifle, it
is recommended that the rifle bore be cleaned after firing 12-15
rounds. See “Cleaning the Rifle Bore” on page 10 in this owner's
manual for cleaning procedures.

M U Z Z L E B R A K E F E A T U R E

The BOSS is available in two versions, the muzzle brake version
(Figure 1) and the CR (conventional recoil) version (Figure 2).

damage when shooting a BOSS-equipped rifle. Wear shooting glasses
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.

B O S S S P E C I F IC AT I O N S

The BOSS body length is 2" for all calibers. The size of the gas vent
ports and port pattern is the same for all calibers. The size of the bullet
exit opening 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 your rifle.

The BOSS consists of a micro-adjustable lock nut and body
(Figures 1 and 2). The weight is affixed to the body with LOCTITE

®

thread locking compound. 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.

T H E SW E E T S P O T

Precision accuracy from the BOSS system is achieved by calibrating
your rifle caliber and ammunition from a prescribed Sweet Spot

THE B OSS WITH R ECO IL REDUCING MUZZLE BR AKE PROVIDES
SUBSTA NTIALLY INCREAS ED NOISE AND MUZZLE BL AST. ALWAYS WEAR
HEARING PROTECTION TO PRE VENT HEA RING LOS S OR DAMA GE.

2 3

setting found on the BOSS Sweet Spot chart. The chart is available
separately from this owner’s manual. If you do not have a Sweet Spot
chart, call [phone] to request one. You can also find Sweet Spot
information at browning.com.