The 270 is a non mag mag so failures of frangible type bullets at close range/high impact velocities always possible. Plan for worst scenarios- not the best scenarios... like having to drive a bullet through the rear end and into the vitals of a fleeing wildebeest that has already been hit.... etc. For larger antelope, use a premium, tough bullet, preferably in 150 grain conventional (or 120-130 +/- in monolithics), that shoots best in your rifle. My prefs are: Swift A Frame, Nosler Partition, TSX/TTSX, Norma Kalahari, Norma Oryx, etc.