Pellet Choice for a old gamo hunter 440?

Alright guys my guns are gonna be here tuesday!!!
I got a haley 32 and a 1992 gamo hunter 440 to remind everyone.

Including my mrod, and I should have a daystate in about a month!

Im an addict what can I say.

I need pellet reccomendations for the 440 though? I already have .310 roundballs for the haley.

Its nice looking

and for 75 bucks I just hope it shoots! I dont even know what caliber it is, but can I get some reccomendations for pellets as I only have kodiaks on hand in 22, as thats what the mrod likes.