doc,

I have not shot enough elephant to give you any reliable data. But here is what I have observed:

585 nyati, 750 grain solid, 2250 fps, 3.5 feet of penetration on body shots

500 NE, 570 grain solid, 2150 fps, up to 59 inches of penetration on body shots with Woodleigh FMJ, up to 72 inches of penetration with flat nose solids.

470 Capstick, 500 grain solid, 2300 fps, 10-20% less penetration than the .500 NE with flat nose bullets. It appears to me either that larger meplats really do increase penetration (the .500 NE meplats were much larger than the 470 meplats), or else my testing medium (elephant bodies) is not very consistent, or both.

450 Watts, 480 grain Woodleigh solid at 2200 fps, about 30 to 60 inches.

This is all from memory and may be off a little.