UPACREEK, I may be misunderstanding your question. When you fire form, there really isn't any way to make more or less accurate ammo. the fire forming process is a way of changing the shape of your brass. no matter how you do it, the only thing that will come out of your chamber after firing is a case is something that looks exactly like the chamber. of course, if you didn't load it hot enough or whatever, it may not be at full shape, but the only place for that brass to go is the chamber.
so once you have your brass formed, then its like reloading any other brass.
so said another way: since you cant buy that brass from the store, you have to make it. The way you make or manufacture it is by taking a case and putting it in the pressure chamber of your rifle and pumping 60,000 PSI into it which forces the brass to assume the shape of the chamber. and there you have it.
I am not familiar with this round, but why do you need to fire form? is there a different angle? if you don't want the angle difference, you can specify the same angle when the smith gets the reamer. the you wont have to fire form.