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Ok. The Big gun is a Lobba if I take an Ammo runt. Does it mean I can re-roll my scatter? I would assume yes.

There are three types of Big gunz in the Ork Dex.

For X points per gun you get a Kannon.

For X more you get a Lobbas.

The ammo runts are a seperate cost as listed on P.103 of the ork Dex.

Now to answer what I think is your question:

An Ammo runt will let you re-roll one to hit roll for a shooting attack.

As per P.30 of the BRB this allows you to re-roll the 2d6 and the scatter Dice for the Lobba.

But only once per ammo runt. That part is key