I have done much mountain hunting, and only shot one sheep, a NZ wild or feral ram, on a deer hunt.

I would choose between my Mauser Mo3 in 8x68S or 6.5x65mm, or my Mauser 98 in .30-06.

I don't have any particular light or featherweight rifles.

I don't see a huge difference between the 8mm Magnums and the ,30 calibre magnums, big enough to say the 8mm are too pooiwerful while the .30 Magnums are fine ... Aglo-American cultural bias against the continently 8mm IMO onlyu.