Very nasty. You've been warned. Lots of discussion from both medical and ballistics points of view, so I thought you'd be interested. It's here on the Philippine Defense Forum. I found it as a link off of GunRightsMedia. Femur was not hit but was broken by shock wave, they say. M193 Ball at close range.
For comparison; a fifty caliber (.495") soft lead ball at ~1000 to ~1500 fps on impact will not do anywhere near that much damage, and I can say that with some authority having necropsied four deer shot with same from various angles. The slower round pretty much digs a straight, caliber-sized hole through anything it touches (though I haven't seen a 50 ball hit a femur. I have seen a 7 mm 168 gr match HP hit a femur, on the way out of a deer, having struck initially at ~2.5Kfps and passing through much of the animal, and that broke the heavy bone into several pieces). You learn a few things about terminal ballistics when hunting, so you don't have to listen to much of the talk. The phrase; "Your pistol is the weapon you use to get back to your rifle" comes to mind, only the rifle should be putting lead on target at over 2Kfps according to these chaps.
Now clean up your lunch.