Ben Streven’s Spitfires National League strugglers Barrow on Saturday in comfortable style with a 3-0 victory at Holker Street.
Eastleigh came into the match having lost just one of their past 10 league games, while Barrow were on a five-match losing streak in all competitions.
The visitors needed just 14 minutes to take the lead as top scorer McCallum latched on to a long ball to beat home goalkeeper Joel Dixon, and Ben Williamson doubled the lead just before the break.
McCallum put the result beyond doubt when he headed home his second of the match, and ninth in the league this season, two minutes after the restart.
The Spitfires take on Chesterfield at home this Saturday.