If my experience is any indication MS does not down load his ammo. The box of 570 gr. X's I used in his .500 were loaded with 87.0 grs. of IMR 3031 - with a claimed velocity of 2150 fps, although I am unsure if the velocity was measured or calculated. However, when compared to the loading data I have it must be very close to that figure. The X I recovered from my buff was fully expanded, and made a pronounced lump on the far side of the buff on a quartering towards shot. As close as I can figure, that bullet penetrated about 4' of buffalo. Down loaded? I don't think so.