 McCullum played wide receiver for 10 seasons for the Vikings and Seattle Seahawks from 1974 through 1983.McCullum finished his NFL career with 274 receptions for 4,017 yards, and 26 touchdowns.In 1993, McCullum was inducted into the Montana State Hall of Fame, in 2011 he was inducted into the Kalispell Legends Wall of Fame, and in 2018 he was inducted into the Montana Football Hall of Fame.