IMO the 7mm in most configurations is a wonderful choice for any plains game...with the right bullet. In Namibia some years back, one of the clients was using a 7x57 with 175 grain Nosler Partition. He had shot a large Eland bull that didn't drop immediately and ran straight away from him. He fired a 2nd shot that hit several inches to the side of the tail and put the bull down. The bullet penetrated completely, and was recovered in the brisket. That's +- 6 feet of penetration.