Some of you might not know about this but… +%Granade damage also boosts the overall damage of some weapons, and I am not talking just about the Tediore reloads.
Some of the weapons that cause splash damage get buffed by this stat (actually, the splash damage gets boosted not the bullet itself) Here: https://www.youtube.com/watch?v=arAgxYQF0OU&t=208s
is a short video explaining pretty much how Granade damage works, I recommend you to watch it if you don’t know how it works, it’s interesting.
Also, you can take look at this post about splash damage: [Guide] Splash damage guide
And here is a list of some of the weapons that GET boosted by grenade damage:
Assault Rifles: Kerblaster(child grenade only) Ogre Non-red text Torgue Assault rifles(Non-torgue Barrel) Hail Evil Smasher
Pistols: Thunderball fists(Main projectile only) Non-red text Torgue Pistols Unkempt Harold Hornet
Grog Nozzle Rubi Teapot Infection Pocket Rocket Basic Maliwan Pistols Tinderbox Devastator
Snipers: *none After patch, Volcano After patch, Storm
SMGs: Avenger full throw Non-Bandit Plasma Casters Florentine Hellfire Yellow jacket
Shotguns: Deliverance full throw Teeth of Terra Retcher Omen Blockhead Swordsplosion Twister Non-red text torgue
Rockets: Bunny full throw
General: Non-rocket Tediore reloads Buzz Axe bombardier
Shields: Love Thumper nova The cradle
The original work was made by Bahroo and Blutfatal, I’m just porting it here from here: Grenade damage Resource thread
The question is, Do you guys think it was intended with a misleading tooltip or it is just a glitch? I mean cmon, your +to grenade damage is boosting your Grog Nozzle/hellfire damage? that is some fine nonsense right there.