What do BM PvP hunters gem for?

^TitleSaysItAll^
Agility, and 2ndary stat should be crit or mastery depending on preference.
Also you should have 190-200 spell pen.
I go for 220 Spell pen (3 50 gems (blue slots) + 70 cape enchant)

Agility in red sockets

and Agility/mastery in Yellow sockets

I find the extra damage on KC useful for when people like to LoS or get out of range.
concur -

spell pene for arcane shot/pet dmg/poison
agility for crit/ap
secondary stat is usually player specific, can be mastery, crit, haste.

Make sure for pvp you are hit capped, spell pene capped, and resilient enough
KC?

I find the extra damage on KC useful for when people like to LoS or get out of range.

KC?

I find the extra damage on KC useful for when people like to LoS or get out of range.

Kill Command