62 damage with an additional 62 bonus damage on a crit, so 124 damage. With a crit multiplier x5 so 620 damage on a crit? Thats not even factoring in sneak attack damage. Blows the Anti-Material Rifle out of the water.
The unique sniper rifle Gobi campaign Scout Rifle only does 60 damage, which is why I didn't mention it. I am just trying to determine what weapon can do the most damage in a single shot (On a crit). From what I understand if you make your character correctly a fully repaired sniper rifle can crit 100% of the time.