Western Sloper,
You are comparing the same bullet and of the same weight, but quite different in terms of ballistic coeficient, reason by which the 6,5 catches up with the 270 as they both fly further enough.
The 270 makes more noise, recoils about a 35% more and has the potential for a higher killing power. How this shows up while hunting, I am not sure I have noticed it.
Maybe if shooting close enough, when the speed difference is still high, but at the typical shooting distances when stalking, let us say 250-350 yds, I have not noticed it.
