makes you wonder why a manufacturer would launch such a light pellet aimed at FT/HFT if running them close to their limit would put guns over with most other pellets - maybe i'm just not seeing something obvious here.
just a point, my ca100 spits the 8.4's out at 785fps (11.5fps), but only spits 10.6 barracuda out at 650fps (10fpe)
heavier pellets doesn't always mean higher energy
But, my mk4 spits them both 8.4 & 10.6 out at the same energy.
It would be over with the heavier if it was set to shoot mozzies or light crossman though, so depends on the gun.