There isn't a plug nickel's worth of difference between a 25-06 with a 120 grain bullet and a 270 with a 130 grain bullet when it comes to putting down a deer sized animal. And I have never heard anyone call a 270 a poor whitetail round
I have killed a ton of deer with the 270 with 130's and 1 deer with the 25-06 and I believe 100 gr Sierra GK(borrowed rifle) and there was no diffrence in animal reaction.
However if you think your 25-06 bullet is constructed as well as a 270 bullet then you are sadly mistaken.
I am still trying to figure out this statement so please enlighten me concerning bullet construction.