Dytran - Bullet Firing (Strain)

Bullet firing shown with camera trying to stay on bullet. Fringe shows plastic strain value for bullet.
Barrel is rigid in this example (to highlight deformable bullet), but rifling is included which allows for rotation of bullet due to flow
Using Dytran and post processed in Paraview. Simulation also possible in MSC Nastran SOL700.

[@user-dv8xr7ls6b]

Could you help me please with the boundary conditions?? Do you have an example? I have to calculate my model with suppressor and with muzzle brake in ANSYS, but i'm working in solidworks, and can't do this. please!