Winchester Repeating Arms BOSS (Historic Manual) User Manual
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vibration. At this optimum point, either at the peak or
valley of a vibration wave, the rifle barrel is momentarily
motionless. The suggested “sweet spots” (found on a sepa-
rate sheet supplied with this manual) are the starting
points for determining the optimum accuracy of your
BOSS equipped Model 70. Once the true “sweet spot” is
determined for a given ammunition, your rifle will consis-
tently deliver extraordinarily tight groups. The BOSS
allows you to tune your rifle to your ammunition to get
the optimum accuracy for all available factory loads.
When adjusted to the “sweet spot,” the BOSS will com-
pensate for slight deviations in ammunition velocity.
The BOSS will not, however, compensate for poor shoot-
ing or flyers caused by low quality bullets and ammuni-
tion.
TO OBTAIN THE HIGHEST LEVEL OF ACCU-
RACY FROM YOUR RIFLE IT IS RECOMMEND-
ED THAT THE RIFLE BORE BE CLEANED
EVERY 25 TO 30 ROUNDS. SEE “CLEANING
LET FOR CLEANING PROCEDURES.
THE RIFLE BORE” SECTION OF THIS BOOK-
MUZZLE BRAKE F
EATURE
The unique exhaust hole pattern on the BOSS 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 per-
sons nearby, as muzzle blast, debris and ejecting shells
could inflict serious injury.
BOSS SPECIFICATIONS
The BOSS body length is 2 inches for most calibers. The
size of the gas vent holes and hole pattern is the same for
most calibers. The size of the bullet exit hole is the same
for all calibers except for the 338 Win. Mag. The thread
system for the 338 Win. Mag. is different from other cal-
ibers to rule out the possibility of accidentally or deliber-
ately switching components and creating an unsafe
combination.
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