8/7/03 9:24 AM Page 2 T H E B E S T T H E R E I S ™ 02380-BFA_BOSSOMCOVR BOSS O W N E R ’ S ® M A N U A L
02380-BFA_BOSSOMdoc 8/7/03 9:22 AM Page 1 SWEET SPOT CHARTS FOR YOUR BOSS -EQUIPPED RIFLE ARE AVA I L A B L E AT B R O W N I N G . C O M OR CALL: ® 1-800-333-3288 BOSS ® OWNER’S MANUAL (BALLISTIC OPTIMIZING SHOOTING SYSTEM) Very important: Save this booklet. Carefully read this entire owner’s manual before using your new Browning firearm.
02380-BFA_BOSSOMdoc 8/7/03 9:22 AM Page 2 YOU ARE RESPONSIBLE FOR FIREARMS SAFETY These are additional instructions specific to the BOSS® installed on your new A-Bolt or BAR rifle. You must read and understand the cautions and proper handling procedures outlined in this booklet 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 manual upon request.
02380-BFA_BOSSOMdoc FIGURE 1 Micro Adjustable Lockout 8/7/03 9:22 AM Page 3 FIGURE 1A Micro Adjustable Lockout Body Micrometer Adjustment Ring Body Micrometer Adjustment Ring longer will you need to try a variety of ammunition to obtain acceptable accuracy. With the BOSS®, you can tune your rifle to get the optimum accuracy for all available factory loads. When adjusted to its Sweet Spot, the BOSS® will compensate for slight deviations in ammunition velocity.
02380-BFA_BOSSOMdoc 8/7/03 9:22 AM Page 4 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. BOSS S P E C I F I C AT I O N S ® The BOSS® body length is 2" for all calibers. The size of the gas vent holes and hole pattern is the same for all calibers. The size of the bullet exit hole is the same for all calibers except for the 338 Win. Mag.
02380-BFA_BOSSOMdoc 8/7/03 FIGURE 2 9:22 AM Page 5 FIGURE 2A Calibrate the BOSS so ”0“ lines up with the hatch mark on the barrel. ® The micro-adjustable lock nut must be bottomed out. It is recommended you set the BOSS® Sweet Spot setting before sighting in your rifle for windage and elevation. The BOSS® was tested in full turn, 1⁄2 and 1⁄4 turn increments. Tighter groups may be achieved with the BOSS® tested in other positions.
02380-BFA_BOSSOMdoc FIGURE 3 Rotate the micrometer adjustment ring 8/7/03 9:22 AM Page 6 FIGURE 4 Full-turn Sweet Spot increments 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. SETTING YOUR RIFLE’S SWEET SPOT Full turn Sweet Spot settings or graduations are numbered 1-10 and inscribed on the barrel of your rifle (Figure 4).
02380-BFA_BOSSOMdoc FIGURE 5 1⁄10 turn Sweet Spot increments 8/7/03 9:22 AM Page 7 FIGURE 6 Example 1: Sweet Spot set at 6.0 EXAMPLE 1 1 Suppose you have a 270 caliber A-Bolt rifle 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 a 270 A-Bolt 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.
02380-BFA_BOSSOMdoc FIGURE 7 Tighten the BOSS so it is secure 8/7/03 9:22 AM Page 8 FIGURE 8 Example 2: sweet spot set at 2.5 CAUTION: REMOVE THE WRENCH FROM THE BOSS EXHAUST HOLES BEFORE FIRING YOUR RIFLE. FAILURE TO DO SO CAN CAUSE INJURY TO YOURSELF OR OTHERS. ® EXAMPLE 2 1 Suppose you have a 300 Win. Mag. BAR rifle and are using Federal 180 grain cartridges. Referring to the Sweet Spot chart, you will find the average Sweet Spot to be 2.5.
02380-BFA_BOSSOMdoc 8/7/03 FIGURE 9 9:22 AM Page 9 FIGURE 10 Barrel Mounting Screw Trigger Guard Screw BAR Forearm Locking Screw given ammunition. As in any sighting-in process, the best results are obtained through trial and error. You may need to retune the BOSS® should you decide to shoot ammunition of different brands, lots and/or types. Be sure to keep a record of your rifle’s Sweet Spots, especially if you use your rifle for different game and shoot different loads.
02380-BFA_BOSSOMdoc 8/7/03 9:22 AM Page 10 NYLON LOCKING DEVICE A strip of nylon in the threaded portion of the barrel helps keep the Sweet Spot properly positioned. This locking device keeps the components tight to the barrel, which is essential to optimum accuracy (Figure 11). The nylon may become worn with prolonged use and may require replacement. Replacement nylon locks are available from the Browning parts department located in Arnold, Missouri.
02380-BFA_BOSSOMdoc 8/7/03 9:22 AM Page 11 CLEANING THE RIFLE BORE To maintain the utmost accuracy from your BOSS®-equipped rifle, or any rifle, extensive testing has proven that the rifle bore must be cleaned after every 12 to 15 rounds. CAUTION: BEFORE CLEANING YOUR RIFLE, MAKE CERTAIN YOUR RIFLE IS FULLY UNLOADED, THE MAGAZINE IS REMOVED, THE SAFETY IS IN THE "ON SAFE" POSITION AND IT IS POINTED IN A SAFE DIRECTION.
02380-BFA_BOSSOMdoc 8/7/03 9:22 AM Page 12 NOTE: 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’S 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. With the components disassembled, wipe each component with oil.
You Are Responsible For Firearms Safety As a gun owner, you accept a set of demanding responsibilities. How seriously you take these responsibilities can mean the difference between life and death. Failure to follow any of these instructions can cause extensive damage to your gun and/or possible serious injury or death to yourself and others. There is no excuse for careless or abusive handling of any firearm. At all times handle any firearm with intense respect for its power and potential danger.
6. BEWARE OF BARREL OBSTRUCTIONS, for the safety of both your gun and yourself. Mud, snow, and an infinite variety of other obstructions may inadvertently lodge in a barrel bore. It takes only one small obstruction to cause dangerously increased pressures that can ruin (swell or rupture) the finest rifle barrels. BEFORE CHECKING FOR A BARREL OBSTRUCTION, BE CERTAIN NO LIVE ROUND IS IN THE CHAMBER AND THAT THE MAGAZINE IS REMOVED AND FEED MECHANISMS ARE COMPLETELY EMPTY.
11. BE SURE OF YOUR TARGET AND BACKSTOP. Particularly during low light periods. Know the range of your ammunition. Never shoot at water or hard object. 12. ALWAYS UNLOAD YOUR RIFLE'S CHAMBER BEFORE CROSSING A FENCE, CLIMBING A TREE, JUMPING A DITCH OR NEGOTIATING OTHER OBSTACLES. Refer to "Unloading The Rifle" for instructions on the unloading of your rifle. Never place your loaded rifle on or against a fence, tree, car or other similar object. 13. WEAR EYE AND EAR PROTECTION WHEN SHOOTING.
20. READ AND HEED ALL WARNINGS in this instruction book, on ammunition boxes and with all accessories that you install on your firearm. It is your responsibility to secure the most up-to-date information on the safe handling procedures of your Browning gun. Browning assumes no liability for incidents which occur when unsafe or improper gun accessories or ammunition combinations are used. 21. PERIODIC MAINTENANCE -- AVOID UNAUTHORIZED SERVICING.
02380-BFA_BOSSOMCOVR 8/7/03 9:24 AM Page 3 SERVICE OR REPAIR If your firearm should require service or repair, we suggest you first contact a local recommended Browning Firearms Service Center. Contact your Browning sporting goods dealer or call our service department for the address of the Service Center nearest you. Alternatively, you may send your firearm directly to our own service department. For technical questions about your firearm, call our service department.
02380-BFA_BOSSOMCOVR 8/7/03 9:24 AM Page 4 SWEET SPOT CHARTS FOR YOUR B O S S - E Q U I P P E D R I F L E A R E AVA I L A B L E AT B R O W N I N G .
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