The way I see it:
Indoors = .2 (gets to your target faster)
Outdoors up to 370 FPS = .25 (Much better range and bush penetration)
Outdoors 370 to 430ish = .28 (Even greater range and bush penetration, but has the extra FPS to keep the BB moving quickly)
outdoor 400+ = .30 (Greater range, less deviation by wind ect ect)
After .28 its really up to what the shooter prefers and what the situation calls for... .40 and such are basically dedicated sniper rounds
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