250A for brushed motors. Then you're looking at heavy duty Industrial ESC's, like for forklift controllers. Sevcon is what I look for then.

On the other side, drives in heavies, even with PERM or LEM's don't need 250A. The only reason they need heavy duty ESC's is the idiotic back emf.
For a weapon , do like John did in Beta, and use an Albright 280 or 288 relay.