There "is" a use for the 175 Nosler partition for the 7 mag. It's for the big bears!!
The 175 NP in a 7 mag is big medicine for the big bears and it would be my choise for that use. I do agree that the 160 NP is just fine for elk sized animials. The 175 will out penetrate the 160, as it should!! Of course, you don't need it (175) for elk sized animials.
Drilling Man