This works especially well with servers that have renown bonuses 20%.
With the new patch you get 150% rp in bo's and keeps.
Throw on any bonus renown gems you have have got from events.
So with rvr zone and bonus total at 270% with bonus, slap on your +% bo renown tactic and your gem and its maxed out.

-Find a friend on the opposite faction (higher rr the better).
-Meet them at a bo somewhere.
-The first kill you get 100% then it degrades on the 2nd and 3rd kill.
-Relog and it resets! Rinse and repeat for serious gain.
-Also you get crests off of each other.