I have shot a 7x57 for years and killed many hundreds animals with the cartridge.While I have not done tests on all the 140 grain loads I would strongly recommend using the 154gr Hornady and larger bullets on big game.173 grain loads are king in Afrika with the 160's catching on fast.I have done a lot of ballistic tests with various 140 grain bullets and in my opinion are worthless on anything but varmints.I refuse to use a 140 on big game because of this.A Hornady 154 interlock is a superbly designed bullet and holds together and penetrates much better than any 140 ever made.In the 7mm class of cartridges from 7mm Mags to the 7mm/08 the only time I have seen bullet failure is when a 140 grain or smaller bullet is being used.