It is a 33 grain projectile with 230 grains of powder. It travels at 5883 fps i.e. Mach 5.
In order to make the projectile not disintegrate special barrels have to be used: 3-groove, polygonal-rifling 1:20″-twist. The bullets are not jacketed but turned on a lathe.
As for the airsoft, 550 is the limit for the local fields.This was with .38g bbs, now I grabbed some .20, I will see what that is.
To be honest I would use the joules as a reference since you will presumably be shooting .38s anyway.
