my opinion may not matter , but youll have A more difficult time ignoring the science of ballistics, and the laws of physics
and decades of field testing,
your 30/06 if loaded with about any decent 165-212 grain projectile will work just fine if you can shoot accurately
but then almost any center-fire rifle if used in a rational manor, inside its known limitations would also.
obviously a good knowledge of the games anatomy and skill operating your rifle of choice helps
One guy I hunt with regularly uses a 1917 endfield mil surplus rifle he really likes , similar to the picture below
thats over 90 years old... the elk never notice, hes 90 years behind the times..