Great story, it must be one of your great memories about your Father for sure...It would be spectacular if you still have his 8x57Mauser he used when killing the elephant.
There has never /will never be a more competent caliber designer than the German designers. The Mauser round be it for the 8x57/9.3 x 62 or 9.3 x70 DWM was the perfect rifle caliber for African plains game as well as dangerous game hunting.
The 9.3 x 62 Mauser was specifically designed for the German farmers in the old German South West Africa colony. It killed the most game in Africa for sure.Since even the farmers in South Africa has the 9.3 x 62 Mauser in the early years of South Africa .
The only reason why the German designed rifles/calibers did not became world leaders sellers is that the German Race has been demonized after the Adolf Hitler Natzi history ...people still think every German is a Natzi even today...
So after the second world war the only hunting calibers that was available to the world was the British and American calibers that became the norm for hunting rifles ...
I absolutely share your view :
Nobody does it like Germans,, So when some Germans did a thorough scientifically good test in regards of penetration on huge monster boars I read it with interest. Shooting at those things, you definitely want to punch an exit hole. Only 9,3x62 and 8x57JS managed full penetration. None of the 30 cals went thru. Even 9,3x57 failed a little to my surprise
To me there is just not a better designed caliber or rifle than that of a German company. The only critique I can voice that really lacks in the 1930 era and later years in Africa hunting is the poor quality of bullets made by the German companies..this is where the great 10.75 x 68 Mauser got it`s bad name from for poor penetration and bouncing off a buffalo boss as described in the Africa`s Dangerous Game rifles book..and in two or three similar incidents in other hunting stories...
This is my personal perspective and believe in German designed rifles ..I only shoot German designed rifles .Since I have an uncommon knack for knowing when a rifle is the best designed caliber in my hands..