Very true but ... we're in the apples to oranges debate.

The 7x57 in the open and shooting standing elephants has been proven to be doable for true world class marksmen with more experience then any living soul is likely to get today.

Is it a good idea, of course not. There are much better calibers for elephant and considering the cost of an elephant hunt it's both ilegal and borderline ridiculous to talk of the 7x57 in this way.

Also you can get 9.3x74r as light or actually lighter then a 7x65r.