There are so much examples of shooting boards , sometimes very sophisticated, here is my square version , very simple :
http://www.labellenote.fr/file/homem...g_board_03.jpg
http://www.labellenote.fr/file/homem...g_board_02.jpg
The originality of my version is more in the way I hold it locked in the vise on the bench. I don't like too much when it's just stopped at the edge of the bench.
http://www.labellenote.fr/file/homem...g_board_01.jpg