Montana State scored 27 unanswered points after Butler tied the game and finished with 498 yards of offense, officials said.
On Saturday, top-ranked Montana State defeated Butler 51-24 in front of 22,277 fans at their Gold Rush home opener, with Jabez Woods sparking the victory via a 100-yard kickoff return.
After Butler tied the score at 3-3 late in the first quarter, the Bobcats responded with 27 unanswered points to lead 30-3 at halftime, fueled by Justin Lamson's 239 passing yards and touchdowns from Adam Jones and Dane Steel.
Taco Dowler recorded 200 all-purpose yards, including five catches for 97 yards and a touchdown, while adding 80 punt return yards to inch closer to the all-time FCS record.
Reigning Big Sky defensive player Caden Dowler left the game in the second quarter with a leg injury, though Coach Brent Vigen stated the issue does not appear season-ending.
Montana State travels to Reno, Nevada, next Saturday to face the Nevada Wolfpack and former coach Jeff Choate of the Mountain West Conference in a matchup scheduled for 8:30 p.m. Mountain Time.