First, before you start talking about up-ing the weight of your BB, it would be nice to know what your gun is shooting, if you are putting out 330FPS increasing the weight may improve your accuracy, but it is going to reduce your range.
Second, How is your gun set up, are you using a Tight-Bore, What kind of Hop-Up Buckling, is your system air tight, Bore-Up Nozzle, Cylinder, Piston, Piston Head.
Third, What kind of Gun, are you assault oriented, Support, Sniper ??
Fourth, what kind of games are you Playing? Backyard, Speed, Mil-Sim, Role Play ??
Last but not Least, What kind of budget are you on, SpeedBall are great BB´s but they are going to cost.
Information, both ways, is the difference from a run of the mill answer, and a great answer.