IMPORTANT: When adjusting the "sweet spot" make sure you grip the knurled surface of the locknut. 1/10 turn increments are set by rotating the micro-adjustable locknut until the desired setting lines up with the hatch mark on the barrel. One full revolution of the micro-adjustable locknut indicates one full change in setting or one index mark on the barrel. To set the "sweet spot," the micro-adjustable locknut is turned either clockwise or counterclockwise until it is aligned with the desired "sweet spot" number inscribed on your rifle's barrel. Smaller, 1/10 turn increments are inscribed on the micrometer adjustment ring. Tighter groups may be achieved with the BOSS tested in other positions.įull turn "sweet spot" settings or graduations are numbered 1-10 and inscribed on the barrel of your rifle. The BOSS was tested in full turn, 1/2 and 1/4 turn increments. It's recommended you set the BOSS "sweet spot" setting before sighting in your rifle for windage and elevation. Note: any change in BOSS setting may slightly alter your rifle's point of impact. We suggest you use our listed "sweet spot" setting as a starting point in determining the exact "sweet spot" setting for your particular rifle and make adjustments accordingly. Even one quarter of a turn away from the "sweet spot" can cause a group to spread as much as one inch or more. "Sweet spots" may vary between rifles of identical specifications with a given ammunition. The "sweet spot" settings in your BOSS owners manual were determined through extensive testing by the Browning Research and Development staff. Precision accuracy from the BOSS system is achieved by calibrating your rifle caliber and ammo with a "sweet spot" setting. The "Sweet Spot" is when the bullet exits the barrel at the top or bottom of the vibration wave, which is the time that the barrel experiences the least motion. (Sweet Spots vary with bullet weight, powder loading, caliber, manufacturing lot and other ammunition variations.) BOSS theory indicates that moving the BOSS device along the barrel changes the vibration frequency.
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