Browning The BOSS Owner's Manual

bOSS®

owner’s manual

B O S S ® O w n e r ’ s M a n u a l

( B a 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 S y 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.

Record the following information for future reference: Browning Model_________________________________

Serial Number___________________________________

Caliber_________________________________________

Purchase Price___________________________________

Purchased From__________________________________

Date of Purchase_________________________________

s w e e t s p o t c h a r t s

Sweet Spot charts for your BOSS-equipped rifle are available at browning.com or by calling [phone].

Y o u A r e R e s p o n s i b l e F o r F i r e a r m s S a f e t y

The instructions in this owner’s manual are specific to the BOSS® System installed on your new A-Bolt or BAR rifle. You must read and understand the cautions and proper handling procedures outlined in this owner’s manual, and in the owner’s manual received with your rifle before using your new BOSS-equipped rifle. If you are missing the owner’s manual for your rifle, we will send you a free replacement upon request. You can also visit our website at browning.com as many of our owner’s manuals are posted online.

THE THREADING ON the BARREL IS FOR BROWNING BOSS COMPONENTS ONLY. DO NOT INSTALL ANY OTHER DEVICE ONTO THE BROWNING BOSS BARREL. DO NOT INSTALL THE BOSS DEVICE ON ANY RIFLE WHICH IS NOT DESIGNED AND FITTED FOR THE BOSS BY BROWNING. DOING SO MAY CAUSE SERIOUS INJURY OR DEATH TO YOURSELF OR OTHERS, and cause damage to your rifle.

G e n e r a l O p e r a t i o n

The BOSS (Ballistic Optimizing Shooting System) allows you to fine-tune for improved accuracy by modifying the vibrations of your rifle’s barrel using an adjustable weight system.

Every time a rifle is fired, barrel vibrations are set in motion. These vibrations occur in all directions, even back and forth along the axis of the barrel. Our research has confirmed that barrel vibrations are the primary cause of inaccuracy. Barrel vibrations are influenced by many factors such as bullet type, bullet weight, primers, powders and barrel configurations. With the BOSS system, no longer will you need to try a variety of ammunition to obtain acceptable accuracy.

You can quickly and easily tune your rifle to get the optimum accuracy for all available factory loads by adjusting the BOSS system to modify barrel vibrations.

The BOSS adjusts the timing of barrel vibrations so the bullet consistently leaves the rifle’s muzzle at the most advantageous time.

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Figure 1			Figure 2
Micro-Adjustable		Weight		Micro-Adjustable
Lock Nut	Body			Lock Nut	Body
Micrometer Adjustment Ring				Micrometer Adjustment Ring
BOSS (with muzzle brake)				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 smallest three-shot group obtained during the BOSS development measured an incredible .051" at 100 yards, using factory loaded ammunition.

When adjusted to its Sweet Spot, the BOSS will compensate for slight deviations in ammunition velocity. However, the BOSS will not compensate for poor shooting or flyers caused by low quality bullets and ammunition.

Note: To obtain the highest level of accuracy from your rifle, it is recommended that the rifle bore be cleaned after firing 12-15 rounds. See “Cleaning the Rifle Bore” on page 10 in this owner's manual for cleaning procedures.

M u z z l e B r a k e F e a t u r e

The BOSS is available in two versions, the muzzle brake version (Figure 1) and the CR (conventional recoil) version (Figure 2).

THE BOSS with RECOIL REDUCING MUZZLE BRAKE PROVIDES SUBSTANTIALly INCREASED NOISE and MUZZLE BLAST. ALWAYS WEAR HEARING PROTECTION TO PREVENT HEARING LOSS OR DAMAGE.

The unique exhaust port pattern on the BOSS with muzzle brake 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 persons nearby, as muzzle blast, debris and ejecting shells could inflict serious injury.

B O S S S p e c i f i c a t i o n s

The BOSS body length is 2" for all calibers. The size of the gas vent ports and port pattern is the same for all calibers. The size of the bullet exit opening is the same for all calibers except for the 338 Win. Mag. and 375 H&H. The thread system for the 338 Win. Mag. and the

375 H&H is different from other calibers to rule out the possibility of accidentally switching components and creating an unsafe combination. Do not attempt to interchange these systems. Use only the BOSS intended for your rifle.

The BOSS consists of a micro-adjustable lock nut and body (Figures 1 and 2). The weight is affixed to the body with LOCTITE® thread locking compound. The micro-adjustable lock nut has a

micrometer adjustment ring. To obtain the utmost accuracy from your BOSS-equipped rifle, it is very important that the micro-adjustable lock nut and body are always tight.

T h e S w e e t S p o t

Precision accuracy from the BOSS system is achieved by calibrating your rifle caliber and ammunition from a prescribed Sweet Spot setting found on the BOSS Sweet Spot chart. The chart is available separately from this owner’s manual. If you do not have a Sweet Spot chart, call [phone] to request one. You can also find Sweet Spot information at browning.com.

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