Bullet hole

The problem is not to design it but to slice it.
I tried it with cura2.6 and slic3r, but they failed.
Cura 14.07 made the job but not well. I had to stop the print afetr the second layer.

The result looks better than expected. I put it on a window and it looks very real.

Please tell me wich slicer You used for.