We are taking our sons and daughters-in-law to South Africa next June for a plains game hunt. Our elder son will shoot a .300 Winchester Magnum with either 180-grain Nosler Accubonds or 180-grain Nosler Partitions, so his bullet choices are already made. Our second son is going to shoot his .270 Weatherby Magnum, and the largest animal on his wish list is a gemsbok. I am trying to determine if he would be better served by a 140-grain bonded core bullet like the Nosler Accubond, a 140-grain partitioned bullet like the Nosler Partition or Swift A-Frame, or a 150-grain partitioned bullet like the Nosler Partition or Swift A-Frame. I do not anticipate any true long-range shooting, meaning ranges will be well within 300 yards. My primary concern is getting sufficient penetration with what is arguably a fairly light rifle for large antelope such as gemsbok, kudu, or blue wildebeest. Any and all recommendations are welcome!