When I was culling brumbies with the .275 Rigby, I used a few bullets and the 140 and 150gn Nosler Solid Bases stayed inside shoulder or chest shots, the 160gn Failsafe's penetrated side on shots but I dug 3 from rumps, bulging under the skin after passing full length, 140gn Barnes X's have penetrated every horse and anything else I have shot with them, regardless of angle, so I have never recovered one. Because we all accept that the bullet does the work, a 7x57 loaded with either a 140gn TTSX or 145 LRX at 2900fps and 2850fps respectively, is enough for anything under 1,000 pounds and more if you can place it well. Makes it harder to justify a heavier bullet unless your rifle just liked them.
