 Kubva paakatanga basa rake remitambo muna 1982, Berg-Knutsen anoonekwa semumwe wevanonyanya kuzivikanwa pamitambo yekupfura yeNorway, ave kubudirira zvakanyanya mumitambo yekupfura pfuti paISSF World Championships, ISSF World Cup, uye European Championships. Akanga awanawo mibairo mitatu paISSF World Championships, kusanganisira ndarama mbiri 1998 muZaragoza, Spain, uye 2006 muZagreb, Croatia. Chimwe chezvinhu zvikuru pabasa rake chakaitika pa2006 ISSF World Shooting Championships, apo akaisa rekodhi yenyika itsva yemapoinzi 1,181 mumakwikwi matatu emamita mazana matatu. Berg-Knutsen akakwikwidzawo mumakwikwi ose ekupfura pfuti pa 2000 Summer Olympics muSydney, uye 2004 Summer Olympics muAthens, asi haana kusvika kumativi ekupedzisira, kana kutora menduru yeOlympic. 