The Register looks at futuristic guns, including a coming-into-production sighting system:
As everyone who has read the Discworld books knows, million-to-one shots actually hit nine times out of ten. Pentagon weaponeers saw no reason why this should not also become true for US military snipers, leading them to begin work on the “One Shot” miracle sniper-scope project.
One Shot works by using a laser to measure not just the exact range to the target (this is already common practice among snipers) but also to measure the wind forces along the bullet’s line of flight. Wind is perhaps the marksman’s greatest bugbear in long-range shooting, so much so that snipers aren’t expected to achieve a first-shot kill any further off than 600m in normal circumstances.
The One Shot instrument, which will replace the telescope used by the sniper team’s spotter, will measure wind, range, inclination, air pressure and humidity. Linked to the scope on the sniper rifle, it will continually generate artificial crosshairs indicating where the bullet will actually strike: it will also indicate the likelihood of a wind shift during the projectile’s flight time, allowing the shooter to pick the best moment to fire. All the sniper has to do is move the crosshairs onto target, wait for the circle of uncertainty to stabilise, and shoot.
According to spec, the One Shot system isn’t quite as good as the Pratchett effect: it will deliver first-shot kills out to 1500m only six times out of ten rather than nine.