Pavlo Padakin and Chase Lang each added a pair for the Hitmen (25-10-4). Brady Brassart, Zane Jones and Austin Calladine, who along with Lang had his first WHL goal, also scored.
Chad Robinson and Braylon Shmyr, a 15-year-old associate player from Calgary with his first WHL goal, replied for Brandon (14-21-4).
The Hitmen outshot the Wheat Kings 44-18.
Chris Driedger picked up his 20th win for Calgary with 16 saves.
Brandon's Curtis Honey stopped 23-of-29 shots before being replaced by Corbin Boes, who fared no better by giving up four goals on 15 shots.
The Hitmen were 5 for 9 on the power play while the Wheat Kings were 1 for 3.