You don't have to hit a person with all 3 projectiles to deal damage (they, in fact, do less damage per projectle anyway). 950 range is pretty decent for what essentially are 3 penetrating linear skillshots in one ability. You don't have to get in someone's face to hurt them in the slightest. I'm always attacking from my max auto-attack range when possible and only ever jump to point blank range if an important squishy is out of position since Graves has really strong burst, and even then, I would only do it as long as I was only in range of my target and 1 other person max.