Speaking of large caliber rifles.....
Barret's new 25mm sniper system.
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"For some long-range sniper missions, a .50 caliber (12.7mm) round just isn’t big enough."
"computerized sight called the BORS (Barrett Optical Ranging Sighting System). BORS is specifically designed for long-range shooting at 1,000 meters and longer distances, measuring and compensating for air pressure, temperature, and the angle of the weapon in relation to the target. Precisely compensating for all these factors and successfully hitting the target on the first shot is possible"
"Effective distance armor piercing “lethality†for the rifle is listed at 2000 meters."
http://www.gizmodo.com/archives/barrets ... 019817.php