Well I am currently hunting mini bosses & MvP's with him. Mainly using aspd stunlock to kill it, having a cruiser, dragon tail, alligator, merman card and not double staffing due to low sp. I know of OAB (apparently the best bow ever) but its not slotted and I suspect there is something else I don't know.
Like the arrows they use, and I am a bit biased towards it due to advise from another Sniper.
About hats Odin's Blessing & Ulle's Cap is another combo that I want to try....experimenting so I guess, I should look for those.
PS I've been a creator/alchemist a long time and my Sniper is my first real class after them.