IMO, a well placed 264" bullet, of good construction, in the vitals, is more desireable than a .308" or .338" bullet of any kind, anywhere else. Energy should never take the place of accuracy.
With that said, I do own both the 6.5-284Norma and .300WinMag, both in factory Savages 112BVSS. The only mods are a Rifle Basix on the .300WM and I swapped stocks on the 6.5 (went to VLP) and had it bedded.
Both will easily make the trip to 1000yds and are scary accurate out to that yardage. I have not shot them further and inside of 600yds I don't know that I could tell the difference in stopping ability and killing power. Both have taken deer and hogs inside that yardage with identical results!
I hunt more with the 6.5-284 because I have better optics on it, the VLP stock fits me better and it kicks less. With a better scope and different stock, I might would lean on the .300 more. I love the raw power! You know I may work on that this year, what a good New Years resolution! Thanks.