What modern sniper rifle has the greatest range?

Answer 1

The longest range of a single-shot rifle, meaning that one round is loaded directly into the ejection port and is pushed into the chamber by the bolt is 2600m. This is achieved by the Barrett M99 .

The Barrett XM109 has the longest range of all Semi Automatic Sniper Rifles with an effective range of 2000m and a maximum range of 3600m

The range of a sniper rifle is also affected by the ammunition used (normally .50 BMG)and obviously the skill of the marksman operating the actual equipment, the longest recorded sniper kill was 2,430 accomplished by a rifle with an effective range of only 2000m