The result marks the third straight Finals appearance for Callister on the back of top-10 places in Park City and Sapporo.
Callister had a strong qualifying performance, advancing through to the eight-man superpipe Final in sixth place.
In the Final, Callister unfortunately suffered a concussion in his first run, forcing him out of the last two runs, giving him an overall placing of eighth.
The event was won by Ayumu Hirano of Japan, with Olympic Champion Iouri Podladtchikov of Switzerland in second and Chase Josey of the USA in third.
IMAGE: The hafpipe for the X-Games in Oslo © EXPN