Callum became involved in Miami baseball as a player beginning in the late 1940s. In 1954, 1955 and 1956 the Jack’s team won the Rural Juvenile crown. Following his years of play he became involved in Manitoba baseball primarily as a builder and has been involved in many developments over the years. He has been greatly involved with the Manitoba Baseball Hall of Fame and Museum, serving as Director in 1998, Vice-Chairman in 2002 and served as Chairman from 2003-2011. He now serves as a Director. As Chairman he negotiated the lease of space in the Morden Community Complex and organized the Expansion Project of 2008-2010 which resulted in the current Manitoba Baseball Hall of Fame and Museum. Callum was also a prominent fastball player and coach of the Seven Sisters team in the North Eastern Manitoba Fastball League. He served as the league president in 1961 and 1962. He has also been highly involved in Manitoba curling as player, club president, and board member and chair of the Foundation of the Manitoba Curling Association.