Here's some more info on the HE-I (Russian version, Iran makes one too)round for the 2A42 (Of which there are two versions - 2 x Iranian, 2 x Russian). THe round is actually used in a few different weapon systems.
Explosive type = A-IX-2
Fuse type = A-670M (point detonating)
Main charge weight = 0.123kg
Weight of the round itself = .386 kg
Total cartridge weight = .8?? kg
Projectile speed = 950-970m/s
Point detonating with an A-670M fuse
Self destruct at 7.5 secs to 14.5 secs
Perhaps someone good in math can do the paper work with this.
The AP-T round can penetrate 20mm of RHA at 60 degress at 700m with a velocity of 960-980 m/s.
This is all from the internet.