At the 2007 Biathlon World Championships in Rasen-Antholz, Italy, Berger was part of the Norwegian team that won silver in the 4 × 7.5 km relay.

After several disappointing races, mainly due to unstable shooting, Berger was thrown off the Norwegian national team ahead of the 2008/2009 season.

He was regarded as perhaps the fastest skier on the biathlon tour, but his lack of shooting accuracy often prevented him from producing consistent and winning results.

In 2014, Berger won gold medal in the men's 15 km cross county skiing in the military world championship in Sodankylä, Finland.

[3] 5 medals (1 gold, 4 silver) 7 victories (7 Sp) All results are sourced from the International Ski Federation (FIS).