I just use my new male cast to level my bullets
he is only lvl 33

This how i level my GM bullets(if your reccomend something better please let me kno)
Rifles: Plains Overlord.....or anywhere really....i just go there so i dont have to wear about being hit.
Shotguns: Plains Overlord/Sleeping Warriors
Twin Handguns: (same as rifle)
Laser Cannon: Sleeping Warrior

So its parum all day.....and the good thing is....there both at the same lobby lol

of course im pretty sure there are better places to level them. I just do that so i can multitask
(watch tv, be on the computer,etc)