My son and I are planning a father/son plains game hunt. His only centerfire rifle is a Mauser chambered in .270 Winchester. I will be using my Mauser chambered in 9.3 x 62. We will be hunting Springbok, Warthog, Gemsbok and Kudu. Will the .270 with premium bullets such as the Barnes TSX or Swift A-Frame do the job or should my son consider upgunning?