Taking the liberty of "improving" BobinNH's statement.
Given cases of equal capacity and bullets in the same weight range at similar velocities, comparable 6.5's and 7mm's might kill BG animals as well as the 270.
Time has proven that: "I stongly suspect the 270 is "better" than many of its' detractors. If you can't do it with a 270, you likely can't do it with a comparable 6.5 or 7mm either." I could not improve this statement.
In the field, much to much can be made of some of the technicalities. As a hunting tool, the 270 has withstood the test of time. Combines with John Noslers 60 year old Partition it simply gets the job done. Not even sure the newer, high tech, bullets, exceed that standard.