Mule Deer has posted here in the past that some of the bullet weights and calibers popular for elk have been made tougher. IIRC he specifically mentioned 165 and 180 gr bullets in 30 caliber. There may be others.
I have some 338 caliber BT's that are elk tough. If I remember correctly, they may have dropped them in favor of AB's for the respective weights. I have plenty of both.
