100g Hornady flat base, 52-53g of IMR 4350
Antelope are easy to kill. I have killed them with 7 Mags, 270's, 300 WM, 243's, 6mm Rem, and 223's.
Last antelope buck I shot was with a a 223 with a Win 55g soft point at 3050 fps muzzle velocity at 430 yards, DRT!