I've never had nor observed Elephant powder. The Schutzen powder I have in 2F granulation seems less powerful than GOEX.
Time will tell, but to get good groups even at only 25 yards, I had to increase the load in my 14 bore rifle quite a bit.
Swiss burns at quite a bit higher temperature and seems once a certain pressure is met, it will leave a 'crust' in the bore ahead of the ball.
I have not used it in my ML's, so cannot remark on that "property" by personal experience. The load parameters of those who have remarked this "trait" are unknown to me.
I do know that a friend uses 140gr. Swiss 1 1/2F in his 16 bore with good "normal" results.
My Moose load for my 14 bore rifle, is 165gr. 2F GOEX for 1,550fps. It gives the same accuracy to 200gr. of 2F GOEX at 1,700fps.
I have not chronographed Schutzen powder in any of my rifles.