Zam: Good, but not as good as any of the others. First one out.
Boba: Very good, but he couldn't pull out his rifle as fast as Jango could pull out a blaster so not him.
Chewbacca: Also very good but it'd take him longer to get out his crossbow that it would take Han to draw a blaster.
Han Solo: Very good and quick but not as quick as Jango.
Now I can't decide. Jango's extremely quick (seeing as how he took out Coleman trebor) but Aurra's got the Force, she could just use it to get her blasters to her hands and use the Force to help her aim. Both have 2 blasters so that's equal. i guess I'd say Aurra cause she could use the Force to cheat and get Jango's blasters and shoot him.
Okay, let me try to decipher the victor here... because it's not really as simple as who gets the first shot in.
I agree, Zam would be out of the fight fairly soon, since she is less skilled than the others. Now, I think Chewie would be the second one down, don't get me wrong however, he wouldn't go down without a fight. That leaves, Aurra, Boba, Jango and Han. Han and Boba have fought head to head before and stalemated quite a bit. Boba is also very underrated on these forums and is very proficient at what he does. I'd say Han goes down next, despite his luck/resourcefulness, because he doesn't have the defense or firepower of Boba/Jango, or the reflexes of Aurra (who also has killed Jedi before). That leaves the remaining three. I think Aurra would be out next, for two reasons. She does not have her saber (hence the shootout) which she relies on quite a bit, nor does she have the defense (armor) of Boba/Jango. Then it all comes down to the two Fetts. I really can't decide who would win that, but whoever does is the victor.