Here... you can look at all of the available perks
http://db.planetdestiny.com/items/view/1054959830
Everyone will have different opinions on shotguns and perks... but for PvP, I [i]recommend[/i]:
•Aggressive Ballistics or Field Choke
•Shot Package
•Rifled Barrel (or Small Bored for LiTC)
•Final Round (or LiTC)
NOTE: PC+1's hidden stat, [i]Aim Assist[/i], is a STAGGERING 70... Felwinter's Lie & Matador-64 can't even come close to touching that... this make landing your pellets at EXTREME ranges very reliable (especially with Shot Package).
For PvE/PoE: Full Auto w/whatever else works for you.
Have fun... and Happy Hunting Guardian ;)
English