The general consensus for the "best", and also a pretty clean opener, is:
HE>B4B>HC>RS>Hot Shot>(Pot)>Lead Shot>(Reload)>Split>(WF)>Slug>(QR+Reassemble)>Clean>(RF+Ricochet)>Split>(Gauss)>Slug>(Head Graze)>Split>(Blank)>Clean>(GB off if you want to stance dance)>Slug...

I honestly don't remember how I did in lower ilvls (I only recently got i190 w/ i200 wpn) but I can do testing sometime with i180 and see how it is.