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While watching the codex review I saw three strategems that you could use for tankbustas so theirs one where for 1cpt you can through grenades and anther which would have cost 2cpts where you can add one to your dakka dakka dakka rule then for bad moons you can fire twice for 2 cpts. So their grenades are strength 8 ap _2 d6 damage grenade d 3 firing twice re rolling to hit against vehicles and fives and sixes equal fire again with shots re rolling.
Please correct me if I am wrong:)

This is correct, but it gets better. Rules as written, with the more dakka stratagem those tankbustas would _always_ hit on 5s and 6s regardless of modifiers so you threaten flyers and skimmers with pesky negative modifiers. The downside is Shoot again + more dakka is 4CP so it is not cheap.

Yes but I do think I could kill a super heavy or two with it but yeah it is good:)

Yeah I think if I made an ork army I would build it around firepower :)

Am I right in thinking if the tank busters was badmoons they would also get 're roll ones on the 're roll to hit vehicles?