I recorded this actual live-gameplay demonstration of the Raze Ult splash damage. If you frame-by-frame the explosion and check how far Reyna is (to the right), it's quite a distance. Notice there's no assist on the 2 deaths. I've also...

I get confused when to use the ult, but I usually use it when there are 4 or 3 players left on the enemy team. But I'd like to hear your opinions on it.