That is Saeed's, warped sense of humor.

Saeed, a prince of Dubai, owns http://www.accuratereloading.com He is the one who drops to his knees laughing in the video. It is done in his basement reloading room and test range.

What you do not see, is that Saeed is setting up his "victims". He shows them the gun, shoots a couple of very low power hand loads in it. Then he puts in full power loads and turns on the camera.

Here is the load data:
http://www.accuratereloading.com/577tyr.html

It generates approximately 183 ft lbs of recoil.

Pete

http://www.damascus-barrels.com/Movie.html