I was in the same situation not to long ago, wanted a new rifle with mulitple capabilities. Since I Bow, ML and Rifle hunt for game I wanted a gun that would become my all arounder but wouldn' t be called on for Larger game yearly (ie: Moose or Elk), however it would most likely see yearly deer action. Coupled with my poor shooting shoulder and my personal requirement to head to the range and keep in good shooting form, I settled on a the 7 Rem Mag. The recoil is noticably less which poses no problem for me to sit down and plink paper.

But it really is a coin toss, both are equally up to the task. If you really want or desire a 300 Win Mag, then buy it. The only displeasure you' ll have is not buying what you truly want!