Remake Koggy's Ult?

I want to start by saying that I don't propose this lightly since I love AP Koggy.

Alright, that out of the way. Riot can't buff AP Kog as they have helped out off-builds like AP Ez and AP MF. The reason for this is really rather simple. When AP Koggy is strong it's nearly impossible to contest objectives because of his crazy poke. And that's a shame. It leaves poor Koggy sitting down there in 'will get curb stomped if I get popular' tier along with Poppy.

So to that end... A remake for Koggy's Ult to make it more useful to the only build Riot will allow to even approach being viable. Ranger Koggy.

Living Artillery: Kog'Maw empowers his next auto-attack to gain bonus range and damage to his target and foes near them. The attack still uses his Ult particle and projectile, allowing it to bypass Wall effects and giving the enemy team time to move away from the poor sod that just got targeted so they can avoid the AoE damage. This ability would retain its quickly ramping mana cost to prevent it from being spammed until you sink a bunch of gold into Mana.

So what would this do?

It wouldn't improve Kog's damage output, for one. Koggy already deals lots of damage regardless of his build. He doesn't need more. It would allow him to let Cait know how everyone else feels once he hits level 6. It would allow him to attack from non-suicidal ranges when his W is down, though he would be sharply limiting his rate of attack to do so. Most importantly it would cement him as the super long range auto-attack champion, a title that's been watered down pretty significantly with the release of Jinx.

The question, of course, would be how much range would the Ult give him? An extra 40 would put him back at 750 with his W up, which is how much range he got from the thing originally before Riot had the bright idea of nerfing his defining strengths instead of making his weaknesses more pronounced.

Anywho, thoughts on the concept?