Kneel with the heavy 264WM and send a 143gr ELD-X at 3240 right at that shoulder so if it exits it will be at the back of the off-side lungs. Anything but broadside I hold more for the exit than entry. I'd have the elbow locked inside my knee to prevent joints rolling on each other. I practice shooting the rolling/bouncing ball targets from this position regularly for my coyote hunting. I've got 2 maybe 3 whitetail better than him on the wall, I can keep the nerves at bay long enough to make this shot before the adrenaline dump. Then it's time for celebration, pictures, and to haul him somewhere warm for further processing!