Originally Posted by ElementSteel
Like I've said, it's to balance out the fact that he has that incredible attack speed, ergo not needing to buy attack speed items. Sure, that's a cost, but how would the two not balance out each out? The cost isn't even that limiting either, or am I wrong to believe that 2 seconds is short enough?
The one other thing I can think of to fix this issue is to put back his old ultimate. Originally, he had a bullet-time ability (not the bullet-time that Miss Fortune has, mind you) and that made it so he had a short duration to continually shoot without using up ammunition. Would that solve the problem?
...You don't seem to understand the problem. Lemme break it down for you.
Problem 1: Early Burst. Vaughn has roughly twice the dps as any other character early game. That means he is basically guaranteed First Blood if the opponent doesn't just run and wait for him to run out of ammo and be completely and utterly vulnerable.
Problem 2: If he runs out of ammo, he is completely and utterly vulnerable. That is a place no character, especially an AD carry, should routinely put themself. An AD carry's laning phase is all about last hitting: This guy can't last hit without risk of completely and utterly crippling himself.
Problem 3: Two resources. Right now you have a 2 resource character. Can you name another two resource character? I'll wait.
Found one yet? No, you haven't, because they don't exist because it's a terrible idea to try and have someone manage two resources. The close we've got is Olaf, who just swings so hard he breaks his arm basically. And there's already a health bar, so it's not like he'd need two bars to manage that particular deal. But your champion would. Your champion needs two resource bars, unless you intent to make the player just keep track of a Charge Buff type deal. For every shot.
Problem 4: No purpose. There's no purpose for this. Why would you remove an entire build-path for a character? Why would you add a resource for the one thing in the game that NEVER HAS A RESOURCE? Why do you not use this resource for his whole kit, instead using boring old mana as a substitute for ammo when you feel like it? And, most importantly, why do you think that balancing it purely by numbers is the only thing that matters? It doesn't matter how your balance it, your system is broken. You will end up with a perfectly balanced pile of rubble. Good for you. You have successfully balanced a horribly unfun mechanic.