I used ProMash at 75% efficiency. For 5 gallons:
12.5 lb two row
12 oz 15L
1.75 oz Columbus, FWH (15% aa)
1.0 oz Centennial at 0
2.5 oz Centennial dry hop
It gave me 105.1 IBUs total, 1.071 SG.
These are all estimates, as you know. Not sure who's brewing software is the most accurate at calculating bitterness, but we've gotten a lot of questions similar to yours, so obviously there's a lot of variation.
Amahl Turczyn Scheppach