There has to be a way to make more of it here. If there's not enough iron, ceramics and gunpowder should work fine.

Maybe we could even make one of your modern molds, but modified to the nonmagical resources here?

[Nobunaga is intrigued by Eustace dragging it out. It is, of course necessary, lest one just concede defeat to him directly, but it's not a style nearly anyone but Mitsunari employs against him. Maybe he just hasn't been irritating Eustace as much as he does others? Or at least, not enough to overcome the spark of competition and ambition! GRAND!]