bOSS ® owner’s manual
BOSS ® O w n e r ’ s Ma n u a l ( Ba l l i s t i c O p t i m i z i n g S h o o t i n g Sy s t e m ) Important: Carefully read this entire owner’s manual before using your new BOSS-EquipPed Browning rifle, and save it for future reference.
Figure 1 Micro-Adjustable Lock Nut Figure 2 Micro-Adjustable Lock Nut Weight Body Micrometer Adjustment Ring BOSS (with muzzle brake) Body Micrometer Adjustment Ring BOSS-CR (conventional recoil) Once the BOSS is adjusted to this “Sweet Spot” for a given ammunition, your rifle will consistently deliver extraordinarily tight groups. In fact, BOSS-equipped rifles in a variety of calibers are capable of producing 100 yard, one-hole groups with precision ammunition.
The chart lists average, or suggested, Sweet Spot settings. These settings were determined through extensive testing by our Research and Development staff. Sweet Spots may vary between rifles of identical specifications with given ammunition. Even one quarter of a turn away from the Sweet Spot can cause a group to spread out as much as one inch or more.
Figure 6 Full-turn Sweet Spot increments. Figure 7 1⁄10 turn Sweet Spot increments. 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.
3 Since the Sweet Spot is listed as 2.5, the 5 inscribed on the micrometer adjustment ring should line up with the index mark or vertical line on the barrel (Figure 10). Figure 10 4 Using the special wrench, Example 2: Sweet Spot set at 2.5. tighten the body of the BOSS so it is secure against the lock nut as explained previously. Your BOSS system is now calibrated for 100 grain ammunition using a 243 Win. BAR rifle.
Ca r e o f y o u r BOSS - e q u i p p e d R i f l e IMPORTANT: The BOSS is a precision instrument. In order for the BOSS system to operate effectively, it is extremely important that your rifle remains in its original purchase condition. It is necessary for the barrel to remain free-floating and the action properly bedded. The above statement holds true either for the A-Bolt or BAR.
3 If necessary, the BOSS may be removed to facilitate cleaning your rifle. NOTICE! WHEN CLEANING THE BAR WITH THE BOSS REMOVED, THE PLASTIC CAP (CROWN AND ACCURACY PRESERVER) PROVIDED WITH THE RIFLE SHOULD ALWAYS BE USED TO PROTECT THE MUZZLE CROWN. ALWAYS MAKE SURE THE CAP USED MATCHES THE CALIBER OF THE RIFLE BEING CLEANED. THE CALIBER IS MARKED ON THE END OF THE CAP. Clean the BOSS by unscrewing the body and micro-adjustable lock nut from the rifle.
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