Regarding the .458WM, how's this from the past? "...it is doubtful if more power is necessary until safaris are possible on Mars or some other planet." P. O. Ackley Vol 1 HANDBOOK FOR SHOOTERS & RELOADERS Page 500.
What did those old timers know anyway ? They were killing things with 6.5 MS , 7x57 and 30-06's ? 🙄