The 8x57 can certainly make a good plains game gun with a variety of bullets available now. The 195 gr. Hornady is a good start. The TSX you mentioned, Noslers etc. I killed my first ( and still my best) Kudu withy an open sighted 8x57 shooting bullets that were old school compared to what's out there now.
The 195 gr Hornady loaded to about 2,500 fps is a capable round with 2,700+ foot-pounds of energy at muzzle, and it approximates the traditional European 196 gr loads.
