1000 grs of course, but I think you knew that. The .700 NE is proof that there can be too much of a good thing. A 1000 gr bullet at 2000 fps in an ultralight 16 pound double rifle results in recoil that can only be described as vicious. Mark Sullivan carried his for a couple of seasons before he concluded this thing was just intolerable. One could only imagine what it might be like in a light weight Kimber. Probably the game would have a greater chance of survivability than the shooter. For best results, mount the scope 2" behind the cocking piece.