9,3x57 - fully grown roebucks in central EU normal weight is 16-23 kgs, up north they may get a tad bigger...hunting calibers range from 222 Rem up (optimal would be 243 Win or something in 6,5 mm) - I use bigger calibers solely because there are always big guys around (boars and red deer) beside I am always on stand by for a possible tracking and have no intentions to carry two rifles along.