A 270 grain bullet should be sufficient for those animals. I used a 270 gr TSX for seven different plains game animals up to gemsbok and zebra in size last fall. All were one shot kills and complete pass throughs. Some very experienced PHs have written that that the 270 gr TSX in 375 is acceptabl for Cape buffalo. I cannot; however, compare the TX with the Triple shock as I've not used it.