Use heaviest bbs you can get, assuming you running full power. I use 0.43-0.48g depending on availability. And you should at least try to use an optic. Red dot or magnified or whatever, it helps a ton for single shot. I run a mix of scope and red dot on my SPR300 and both are great: red dot is lighter and faster, better for medium and short ranges; scope is heavier and slower to scope in, so better for longer ranges. Getting quick scopes with a red dot is very fun though. Also, get yourself a cheap chrono like the xcortech mk3, it comes real handy when you're testing power before game day. If it's above the power limit, just cut the spring bit by bit until you get it right.
In terms of play style... I just run and gun with it like I would with an AEG. Play it like you would in a game. You will be severly disadvantaged with normal AEG power levels though. The whole point of a bolt action is to get a significant range advantage. You will basically just have to camp corners or jiggle peek because you only have one chance to catch someone before being forced to move away because you don't have the same volume of fire as a rental with a g36c does.