Poisoned attacks to gargantuan creatures

ok i just want to make sure i read it right all of our poisoned attacks hit a gargantuan creature with 6 only?

I'm assuming you mean wound rather than hit.

We hit normally. But yes, only wound on a 6

Yep. It sucks.
Hit normally, but Poison only wounds Gargantuans on a 6.

From the Gargantuan Creature rules:
".....attacks with the Sniper special rule only cause a Wound on a roll of a 6. Attacks with the Poisoned special rule only cause a Wound on a roll of a 6 (unless the attack's Strength would cause a Wound on a lower result)."

Fleshbane works fine though so go to town with Ichor Injectors.

Ok thank you