The rounds from Orisa's cannon fire in a fixed spread pattern and do not fan out in a cone. This, combined with the fact that her bullets have no damage fall-off, gives Orisa some appreciable suppressive fire potential. While the bullets are very quick to leave the gun, they are not hit-scan, and is more akin to D.Va's Light Gun than her Fusion Cannons. There is no advantage to burst-firing; the first bullet can spawn anywhere in the spread and the spread never blooms out, so the player is free to use her gun fully automatic with no loss of accuracy.