Hey Mike, the 900 grains was for Moose and Grizz/brown bears. For the rest of the critters it was a proposed 650 grains! The info used to come with these figures was the Natal Study. Just picked up my copy a couple weeks ago, plus a copy of the study done in TBM by Dr. Ashby. Its all interesting to say the least. It proves what I preach but 900 grains...heck it looks like I am headed to shooting REBAR <img src=icon_smile_big.gif border=0 align=middle>!