Can you guys inform me on this may be question ?

I have read & heard from others that the 700 NE is no great killer and has poor penetration ,I have not used one so don,t know the truth ,could be bad press like on the 458 Win which IS unture!
Then on the other hand the 12 Bore is a wonder killer even on Elephants ( well Indian any way )with harden LEAD slugs ,the 700 Ne has good bullets ? and solids so how can this be ?
I have a big 12 Bore but have not put it to use "YET"

What are your thoughts on this please