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All fields use muzzle energy limits, not fps limits.
When a limit is "400fps on a .20" that's actually an energy limit.
When a limit is "420fps" it is just implied that it is measured with .20g BBs, and is still an energy limit.
Be aware of what your local field limits are and stay within them.
As for performance, the rule of thumb is to use the heaviest BB possible without losing range. That will give you the best range and accuracy.
FPS is more important for CQB than field use. Lighter BBs lose their velocity faster, and have less accuracy. In field use, it's more important that the BB get further away and accurately. And since heavier BBs lose their energy less quickly, it's possible for a .30g BB to pass a .25g BB in flight after 200ft or so.
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