I grew up (born mid 40s) reading Keith both in his numerous magazine articles and a few of his books. Without a doubt he like more BANG for the buck
. Elmer sort of gave you the feeling a .350 Mag was just about the right caliber for hunting woodchucks and liked the larger 40 calibers for anything bigger.
I read that .45-70 article when it came out and thought Yep that’s pure Keith. Without a doubt he would have liked the new bigger boomers like the .500 and others in its class, but unless out hunting African game or the big Alaska bears I would think his trusty .44 mag would be on his belt.
For you younger folks out there, when Elmer died they (mostly gun writers of the era) did a .44 mag salute for a final send off to the Great One at his funeral.