Winchester Repeating Arms BOSS (Historic Manual) - Manual (Page 4)

THE “SWEET SPOT”
WARNING: THE .338 CALIBER BOSS HAS A
RENTLY AVAILABLE CALIBERS. SWITCHING
IBERS TO THE .338 BARREL COULD CAUSE A
RESTRICTION OR OBSTRUCTION RESULTING
IN POSSIBLE INJURY OR DEATH TO THE
SHOOTER OR OTHERS.
Each BOSS consists of a micro-adjustable locknut and
body (See Figure 1). The body of the BOSS consists of a
weight and muzzle brake. The weight and muzzle brake
are affixed by LOCTITE®. To obtain the utmost accuracy
from your BOSS equipped Model 70 it is very important
that the micro-adjustable locknut and body are fully
tightened before firing.
LARGER EXIT BORE THAN ALL OTHER CUR-
BOSS COMPONENTS FROM DIFFERENT CAL-
Precision accuracy is achieved by calibrating your rifle
caliber and ammunition with a “sweet spot” setting. The
“sweet spots” for your Model 70 are found listed on a sep-
arate sheet supplied with this manual. If you are missing
the “sweet spot” sheet or if there is no “sweet spot” listing
for your rifle caliber or ammunition, call U.S. Repeating
Arms Co. at 1-800-945-1392. “Sweet spot” settings were
determined through extensive testing by US. Repeating
Arms Co. Research and Development staff. “Sweet spots”
may vary between rifles of identical specifications with a
given ammunition. Even one quarter of a turn away from
the “sweet spot” can cause a group to spread as much as
one inch or more. We suggest you use our suggested
“sweet spot” setting as a starting point in determining the
exact “sweet spot” setting for your particular rifle and
make adjustments accordingly. Note: any change in
BOSS setting may slightly alter your rifle’s point of
impact. It’s recommended you set the BOSS “sweet spot”
setting before sighting in your rifle for windage and eleva-
tion. The BOSS was tested in full turn, 1/2 and 1/4 turn
increments. Tighter groups may be achieved with the
BOSS tested in other positions.
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