Battlefield: Bad Company

Harvest Day or any map with artillery. Grab the artillery. Here you can easily grab the big guns trophy and some hard wild cards. You can get about 500-700 points easy.
Follow this priority on things to bomb

1) vehicles that stop moving
2) clusters of people
3) artillery
4) people in buildings.
5) vehicles that are not occupied.

I once grabbed combat efficiency trophy, 2 big guns trophy, three of a kind, five of a kind, full house and STRIKE! SO just keep it up. If you die get back on.


Here's a video that helps. (It's not mine)

MASTER SARGENT

THE FASTEST BY FAR STRATEGY

While boosting BEANS BULLETS BANDAGES you mass loads of exp, when I unlocked my BEANS BULLETS BANDAGES achievement I had 300,313 experience.

Here is my link for full details on BFBC boosting sessions: