Chris Quan
Ansys Employee

FIrst of all, volume of a conical shape is equal to 1/3 x pi x radius^2 x height. Thus, for a cone with base radius of 65 mm and height of 50 mm, its volume is 221 cm^3. Its mass is 376 g, 33% of the mass of a box shape.

Thus, the differece between two simulations is expected.

Next, it would be better if you use Solid, rather than Hollow to define the conical shape. See the picture below.