Buchberger returned a kick 93 yards for a score and he scored on runs of 52-yard run and a 2-yard run.
Buchberger had touchdown passes of 30 yards to Byrce Stark and 11 yards to Zack VanVleet.
Cameron Brayman added a 12-yard TD run for the Wildcats.
Spencer Knizacky scored on a 29-yard run, Travis Tyndall added a 67-yard TD run and an 18-yard TD reception for the Spartans.
Buchberger was 7-of 16 for 77 yards for Montague, Brayman had 17 carries for 135 yards and Eddie Caviedes rushed for 108 yards.
Buchberger rushed for 98 yards for the Wildcats.
Sebastien Archer had nine tackles for Montague.