As reported en.wikipedia.org, highest precision guided artillery projectile M982 Excalibur allows you to confidently use it to engage targets located just 150 meters from its own troops.
Firing range 155 mm shell is 35 km away. M982 Excalibur was used successfully in the summer of 2007 in Iraq. 92% of the projectiles fell just four yards from the aiming point. In 2012, the firing range also achieved 36 km. In 2013, the Pentagon ordered in 2287 at a cost of 53 shells thousand 620 cents per unit, but the number may be less.