TeaSea
SOH-CM-2014
Aim your first shot downwards, above the '10' that indicates the number of shots remaining. It will bounce a few times and then hit the exploding barrel in the upper left corner. Use your second shot to shoot the barrel in the upper right box. Now use the remaining shots to take out the row at the bottom one by one by bouncing bullets off the ceiling.
Takes a few tries but it is possible! I did it in eight shots.
I've managed to get down to one bad guy with 3 shots left....then blown it!