Nope, .3's should give him less speed, because it's the output energy that stays constant. So for the energy to be constant with an increased projectile mass means the velocity is lowered because it takes more energy to get a .3 to the same speed. This isn't dead on for gas guns though, because of the expanding gas in the barrel exerting more force on heavier BB's for some reason or another. The hardcore gas gun lovers/engineering pros can explain how that works lol.
That being said, he should be experiencing a bit of an FPS loss when switching to .28's and .3's. So not factoring in the weird effect of using compressed gas, 420ft/s on .2's should give about 340ft/s on .3's. So I don't know what's up with the rifle, maybe the chrono is off?
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