Heavier BB = more kinetic energy. Same as a real bullet.
And not all guns are consistant with delivering the same energy to BBs of different weights.
Case in point, my old KSC USP Compact. It shot 300 fps whether I used .20g or .25g BBs.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.