Winchester Repeating Arms BOSS (Historic Manual) - Manual (Page 6)

micro-adjustable locknut is turned either clockwise or
counterclockwise until it rests on the desired “sweet spot”
number inscribed on your rifle’s barrel. One full revolu-
tion of the locknut indicates one full change in setting or
one index mark on the barrel. 1/10 turn increments are
set by turning the micro-adjustable locknut until the
desired setting lines up with the longitudinal hatch mark
on the barrel. IMPORTANT: When adjusting the “sweet
spot” make sure you grip the knurled surface of the micro-
adjustable locknut. The knurled portion of the locknut
and micrometer adjustment ring must rotate together to
ensure a precise “sweet spot” setting and retainment of
proper calibration.
CAUTION: WHEN SETTING THE “SWEET
SPOT” ON YOUR RIFLE MAKE CERTAIN YOUR
RIFLE IS FULLY UNLOADED AND THAT THE
RIFLE’S SAFETY IS IN THE “ON SAFE”
POSITION AND YOUR RIFLE IS POINTED IN A
SAFE DIRECTION.
THE SUGGESTED “SWEET SPOTS” FOR
RATE SHEET SUPPLIED WITH THIS MANUAL.
IF YOU ARE MISSING THE “SWEET SPOT”
SHEET OR IF YOUR RIFLE’S CALIBER OR
AMMUNITION IS NOT ON THE LIST,
YOUR MODEL 70 ARE LISTED ON A SEPA-
CALL U.S. REPEATING ARMS CO. AT
1-800-782-4440.
EXAMPLE 1 —
1. Suppose you have a 270 caliber Model 70 and are
sighting in with 150 gr. cartridges. Referring to the “sweet
spot” chart you will find the average “sweet spot” is 2.5
for a 270 caliber with 150 gr. ammo.
2. After having made sure your BOSS is calibrated,
rotate the locknut counterclockwise two and one half full
revolutions. The edge of locknut should line up or rest on
the marking for 2 on the barrel.
NOTE: It is not necessary to calibrate your BOSS on the
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