Mule deer
My son used a Howa 308 with 150grain accubonds for all his plains game. Loaded to 2,900 fps with Hogdon CFE223. 10 animals 12 shots from impala to Hartman zebra and Oryx.
I used my 35 Whelen with 225 grain accubonds and woodleigh 225 grain PPSP @ 2,950fps with a healthy dose of cfe223 and shot my Oryx with a 250 grain Speer hotcore at 2,700fps and cfe223 using Speer reloading site.
In hindsight the plain old 308 would have been enough but I had my Whelen built just for Namibia.
Bob Nelson