[Mystik Spiral]

Using SDKHook_OnTakeDamage, I have already determined that the inflictor is "grenade_launcher_projectile". What I want to do next is determine if the grenade_launcher_projectile is using special ammo, like incendiary or explosive. With regular weapons I can do this using...

GetEntProp(weapon, Prop_Send, "m_upgradeBitVec")

Of course, with the grenade launcher, the weapon is -1, so the above command will not work. If I try the same command above but use inflictor (the projectile) instead of weapon...

GetEntProp(inflictor, Prop_Send, "m_upgradeBitVec")

...it fails with...

Property "m_upgradeBitVec" not found (entity 148/grenade_launcher_projectile)

How do I determine whether the damage from grenade_launcher_projectile includes incendiary/explosive special ammo?