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Tediore reloads are affected by skills that increase grenade damage, I know that much for sure by re-spec testing my Commando a couple weeks ago when someone told me and I didn't believe them.Also, it seems that Plasma Caster damage is also affected by grenade skills. I guess the 'splash' those shots have is also counted as grenade damage.... I use a Tediore Plasma Caster lol
I don't know the answer but if you have both things you can always test them on the target dummy at sanctuary.
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