I only have one PG safari under my belt
In June of 2014
I used a Remington ADL in 30-06 shooting 150 grn Accubonds at 2900ish
I killed eleven different species of game with no lost animals
Kudu........................225 yards
Blue Wildebeest.....100 yards
Black Wildebeest....125 yards
Waterbuck...............200 yards
Gemsbock...............250 yards
Blesbok....................175 yards
Impalas x2...............100 and 341 yards
Vervet Monkeys.......50 to 250 yards
Rock Hyrax s............50 to 300 yards
Warthog....................125 yards
Bushbuck..................225 yards
Like big stick has said.......bullets trump headstamps
I will say placement of good bullet trumps headstamp
Your WSM with a good bullet of 140 or 150 will kill everything your after just as dead as your 338