For hunting applications here in the West I can't think of a use either.
I didn't think it was possible to get a 45 caliber bullet moving that fast. I shoot about 2000 feet per second slower and use a 300 grain bullet. It seems to work just fine. I like a little smoke after I pull the trigger, call me old fashioned.
The guy seems to have the smokeless thing figured out. Pretty impressive for a front stuffer.