There is no real need for a scope on an "elephant rifle" as usually you will be close for enough for it not to matter. The one exception would be with "eye problems" if a scope helps with that.

I would use a .470 any day before choosing a 9.3x74R for elephant. It not only will give more margin for error but should also give one more confidence as well. Again an exception would be if the recoil bothers you.

Otherwise I think the sub-standard marginal calibres are more for experts or experienced hunters than first time (ele) hunters. I shoot a .450 and a 9.3mm as well and would always choose the .450 on elephant if given a choice.

Of course this is based on MY limited elephant hunting experience only.

Use the .470 on your elephant hunt and sell it AFTERWARDS if you wish.