[mas_oyama]

Originally Posted by StrikeFreedom

I don't think this will be the case, given the same setup (spring, cylinder, barrel, etc). Theoretically, with perfect air seal, the air volume coming from the cylinder into the barrel is still the same. So the heavier BB will spend time in the barrel for just as long as the lighter BB. Kinetic Energy = 1/2 mass * velocity^2. With the same energy (Joule from gun) and an increase in BB mass simply yields less velocity (FPS). Subsequently, there's the change in grouping and range as well.

Well I don't know it's been debated a couple times here. I still have to see any proof of whether or not this is true! lol.