RE: Rem 7 mm mag or 7 mm mauser rifle?????
I was going to tell you that I prefer the 7 X 57 Mauser, but was also going to advise you to go with the 7mm Mag.
as long as only the 7 x 57 is now available I' d tell you to jump on it! It is a marvelously versatile round (has it' s limitations) but I think you' ll be pleased with it' s performance on whitetails...and with 175 grainers you can certainly take the bigger game mentioned if you do your job with properly constructed bullets. Good luck with your new acquisition!