I have read Bell inside out, front to back and between the lines several times trying to fully understand his thought process and evolution as an ivory hunter. That was a different age and different culture to be certain. But he had a luxury we will never have to hone his skills in the field by trial and error. He hunted ivory for one purpose, to make a good living providing long term retirement security. He perfected his marksmanship skills and shot placement ability. He developed the skill to deliver a bullet to the brain from various angles by studying in precise detail the anatomy of the elephant. All for the purpose of killing them in the most efficient manor possible given the limited options of rifles, bullets, calibers and reliable ammo in Africa from about 1902 to post WWI. He happened upon or discovered, by both choice and fate, the effectiveness of a small caliber penetrating bullet to the brain. While he was most known for his use of the 7x57 for elephant, I believe he actually held the 318 WR in higher regard as an all around effective elephant killer.
The 318 WR is an older equivalent to our current 338-06... thus the segue to the topic in this thread The only reason he settled on the 7x57 over the 318 WR was the reliability of the ammo at the time. He recalls never having a single misfire nor malfunction of any kind when shooting the 173 gr FMJ 7x57 DWM ammo. He reported having all manner of trouble with the ammo for both the 318 WR and the 6.5 MS. The famous incident of him pass shooting cormorants on the wing just to get rid of faulty 318 WR ammo will forever stand as a testiment to his exceptional rifle skills.
Currently my rifles/calibers for Africa PG and DG include: 338-06, 375 HH, 416 Rem Mag and 450 Watts.
I have 100% confidence hunting everything up to but not including eland with good tough bullets in the 338-06. I have 100% confidence hunting everything up to and including eland with good tough bullets in the 375 HH. I have 100% confidence hunting everything up to and including buffalo with good tough bullets in the 416 Rem Mag. The 450 is in a different category of best use.
I have had a couple of really accurate, fully capable hunting rifles in 35 Whelen and 35 Whelen AI and have nothing against the caliber. For whatever reason, I prefer the 338-06 and it has proven absolutely effective for what I've wanted it to do.