Ask a Bowman Thread.

Most likely Hurricane, though it'd be more helpful to have your actual stats rather than your range. I'm getting numbers that don't make any sense but produce ranges very close. The most important thing is how much weapon attack you have already, since 10 attack makes a bigger difference for someone with 130 attack than someone with 150 attack.

I have a 10 ATT naricain, 15 att SCGs, and atm I'm using a 107 Nisrock, so that's 132 attack. currently at 624 dex with normal equips. I have a hurricane 20 book already, but BE20 seems to be pretty cheap right now so that's not really an issue either.