Fwiw, the 7MM Mauser round was used SUCCESSFULLY to take ELEPHANT, LION & CAPE BUFFALO by WDM "Karamoja" Bell, using 173 grain FMJ military ball.
NOT something that I would try, even once, but he said that it was "adequate at close range" for all those beasts.
(I once saw that particular rifle, when the NRA Museum was in DC & it looked like "nothing special". = Just a cheap, "cut-down" & more or less sporterized Spanish "Scorpion". = The famous author, Robert C. Ruark, I believe owned the rifle at that time.)
My "sporterized" Mauser was a veteran of the Spanish-American War that was "re-done" into a "sporting rifle" sometime in the 1910-20s. The scope was made circa 1930.
(I usually loaded mine with a German-made, long, slim, pencil-like bullet, at a "moderate velocity". = That load is, imVho, A KILLER on most anything out to 200M, provided the hunter does his part.)