You need alot of luck dude its virtually impossible... I spent 3 days streight switching servers like crazy until i finally got thunderspine from a lvl 43 seabeard in gold room. Its epic
The best is to go to gold room of anywhere in tormenta or ravens cove (mainly in south idol room)with seige charge and go crazy.If ur like alot of pirates out there and u hate grenades and didnt bother to level it up to get seige charge blunderbuss is the next best thing(steel shot)..
GOOD LUCK.. dont forget to comment .. let me know if this helped you in any way