PS: C-4 weights 1,44 g/ml so in standard tin can there will be 475g C-4
PPS: 475g C-4 is equivalent to 1.5 x 475 ≈ 700g TNT
And actually a 330ml can has closer to 380ml capacity - there is always ullage in the top of the can.
So you could say if it was C4 you could have something more than 800g TNT equivalent.