Owner's Manual

6 7
3 Since the Sweet Spot setting is listed at 6.0, the 0 inscribed on the
micrometer adjustment ring should line up with the index mark
or longitudinal line on the barrel (Figure 8).
4 Tighten the body of the BOSS so it is secure against the
micro-adjustable lock nut. Use the special wrench supplied with
your rifle. On the muzzle brake BOSS insert the wrench through
one end of an exhaust port and out through another. It is
recommended to insert the wrench through the smallest set of
ports possible. On the BOSS CR insert the wrench through a port
on the end of the BOSS and out through another (Figure 9). Turn
clockwise until the body and micro-adjustable lock nut are tight.
BE SURE TO REMOVE THE WRENCH FROM THE BOSS EXHAUST PORTS
BEFORE FIRING YOUR RIFLE. FAILURE TO DO SO MAY CAUSE SERIOUS
INJURY OR DEATH TO YOURSELF OR OTHERS, AND CAUSE DAMAGE TO
YOUR RIFLE.
E X A M P L E 2
1 Suppose you have a 243 Win. BAR rifle and are using 100 grain
cartridges. Referring to the Sweet Spot chart, you will find the
average Sweet Spot to be 2.5.
2 Calibrate your BOSS and rotate the micro-adjustable lock nut
counterclockwise until the edge of the micrometer adjustment
ring lines up, or rests, on the marking for 2.0 on the barrel.
FIGURE 9
Tighten the BOSS so it is secure.
Full-turn Sweet Spot settings or graduations are numbered 1-10 and
inscribed on the barrel of your rifle (Figure 6). Smaller
1
⁄10 turn
increments are inscribed on the micrometer adjustment ring
(Figure 7). To set the Sweet Spot, the micro-adjustable lock nut is
turned either clockwise or counterclockwise until it is aligned with
the desired Sweet Spot number inscribed on your rifle’s barrel. One
full revolution of the micro-adjustable lock nut indicates one full
change in setting, or one index mark on the barrel.
1
⁄10 turn increments
are set by rotating the micro-adjustable lock nut until the desired
setting lines up with the index mark on the barrel.
IMPORTANT: When adjusting the Sweet Spot, make sure you grip
the knurled surface of the lock nut. The knurled portion of the
micro-adjustable lock nut and micrometer adjustment ring must
rotate together to ensure a precise Sweet Spot setting and to retain
proper calibration.
E X A M P L E 1
1 Suppose you have an A-Bolt rifle in 270 Win. caliber and are
sighting in with 150 grain cartridges. Referring to the Sweet Spot
chart, you will find the average Sweet Spot to be 6.0 for an A-Bolt
in 270 Win. with 150 grain ammunition.
2 After having made sure your BOSS is calibrated properly on the
barrel, rotate the micro-adjustable lock nut counterclockwise six full
revolutions. The edge of the micrometer adjustment ring should
line up, or rest, on the marking for 6.0 on the barrel of the rifle.
FIGURE 7
1
⁄10 turn Sweet Spot increments.
FIGURE 8
Example 1: Sweet Spot set at 6.0.
FIGURE 6
Full-turn Sweet Spot increments.