Thanks to a larger and completely re-engineered CAMputer system, the M1200 ART-XLR can now be calibrated to the majority of todays center-fire rifles chambered for cartridges from as small as the .223 Remington up to the hard hitting .50 BMG. As long as the shooter knows the bullet ballistic coefficient and the muzzle velocity, this scope can be calibrated for more than 75-percent of todays most widely used calibers and rifles to automatically keep hits in the center of mass from 300 to 1,200 meters or within the capability of the bullet and load. To operate this scope, all the shooter has to do is zoom in on a target of known size until it fits inside the brackets of the ranging reticlesteady the aimand take the shot. The CAMputer system automatically compensates for bullet trajectory as the shooter frames the known size target in the reticle.