Thats one of the things I liked about AI wars. Your fleets would only shoot enough rounds at a target to destroy it, then it would move onto the next target or stop firing. Granted there are some annoying situations that arise becouse of this. many times there would be a unit your units are shooting at. Some of your units might be far away but have long slow moving missles. So what ends up happening is the close unit that could easily kill the unit in less then a secound does not shoot at it becouse the other unit has already launched the killing blow, which might take 3-5 secounds to arrive and during that time your units are geting killed.
I think the calculation should be somthing like 125 percent.
Had to read this three times over to understand that AI wars
is the name of the game you are referring to
I'm a bit on the slow side