The Sightmark Laser Boresighter provides the most convenient and accurate method for sighting in rifles of all types. Simply chamber the Laser Boresighter like a regular bullet and a laser dot will show exactly where the rifle is aiming. Using Laser Boresighter it’s easy to sight in any scope without firing a single shot. Live fire is only needed to fine tune the weapon being sighted in order to compensate for inconsistencies, such as bullet drop due to distance. Perfect for hunters, competitive shooters and law enforcement, the Sightmark Laser Boresighter is sure to take the frustration out of sighting in almost any gun. Laser Boresighter is easy to use and will quickly save both time and money by avoiding prolonged live fire tests at the range; use the extra ammo for honing those shooting skills and for the hunt. A lightweight carrying pouch protects the laser of the boresighter for convenient use in the field.The Accudot™ Laser Boresighter is available in several calibers and gages for use with all the most popular rifles and shotguns. Compatible Calibers: .264 WIN MAG, 7mm REM MAG, .338 WIN, .308 NORMA MAG, .358 NORMA MAG, 7mm STW, .300 WBY MAG, .340 WBY MAG, .375 WBY MAG, .485 WIN, 8mm REM MAG, 45-70, Included Accessories: Battery pack for laser boresighter, Laser boresighter carrying case