Owner's Manual

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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
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 I C A T 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 S W 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
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.
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).
THE BOSS WITH RECOIL REDUCING MUZZLE BRAKE PROVIDES
SUBSTANTIALLY INCREASED NOISE AND MUZZLE BLAST. ALWAYS WEAR
HEARING PROTECTION TO PREVENT HEARING LOSS OR DAMAGE.
FIGURE 1 FIGURE 2
Micro-Adjustable
Lock Nut
Micrometer Adjustment Ring
BOSS (with muzzle brake) BOSS-CR (conventional recoil)
Body
Weight
Micro-Adjustable
Lock Nut
Micrometer Adjustment Ring
Body