I've seen numerous post saying seperating PVE from PVP. The easiest way to do that is to do the same thing that you do to increase or decrease damage with different types of guns against A.I combatants.
https://www.bungie.net/en/News/Article/12607
A.I example (Update 1.1.1)
[quote]Shotguns
Increased damage against all non-Guardian combatants by 2x (100% increase)
Reduced high-end range values
Damage falloff starts sooner
Reduced starting ammunition in PVP [/quote]
PVP Example:
Auto Rifles do 3% more damage against Guardians in the Crucible.
Ammo Example:
Guardians pick up less special ammo in Crucible Game Modes.
There. That's it. That's how you separate damage and Ammo. Its so simple. I wish I had thought of this earlier. Comment below on what you think. I already posted this in feedback.