User Guide

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.
NOTE: ANY CHANGE IN
THE BOSS
®
SETTING MAY SLIGHTLY ALTER YOUR RIFLE’S POINT OF IMPACT.
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