"For Buffalo I guess the standard Weldcore .375" 300gr is too soft, after the Informations I have heard and seen."

I think the thousands of Buffalo that are dead might
consider otherwise !!!

I find it hard to believe that a boar / pig hit well with a 375H&H 300 gn bullet does anything but fall over even if it is still kicking. OK, a small number might move a short distance but they are still generally well stuffed.

That has been my experience on them and I have shot quite
a few with the 375H&H and Woodleigh's.