Winchester Repeating Arms BOSS (Historic Manual) - Manual (Page 5)

PRELIMINARY A DJUSTMENTS
Before adjusting your rifle to the “sweet spot,” it is impor-
tant that your BOSS is calibrated with the barrel. This
will ensure that your rifle is consistent with those tested
by U.S. Repeating Arms Co. Research and Development
when BOSS suggested “sweet spots” were determined.
To find out if your BOSS needs to be calibrated, loosen
the micro-adjustable locknut until it bottoms out on the
threads of the BOSS — or will not loosen any further. If
your BOSS is calibrated, the “0” on the micrometer
adjustment ring will line up with the longitudinal hatch
mark on the barrel (See Figure 2).
If the “0” isn’t aligned with the longitudinal hatch mark,
you will need to calibrate your BOSS. Move the microm-
eter adjustment ring, on the bottom of the locknut, so
that when bottomed out on the threads the “0” is aligned
with the vertical hatch mark. To adjust the micrometer
adjustment ring, insert your fingernail or a small pointed
object in the split of the ring and simply rotate the ring
(See Figure 3).
TUNING YOUR RIFLE TO THE “SWEET SPOT”
Full turn “sweet spot” setting or graduations are numbered
0-10 and inscribed on the barrel of your rifle. Smaller,
1/10 turn increments are inscribed at the rear of the lock-
nut. (Refer to Figure 4.) To set the “sweet spot,” the
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