"given the same muzzle velocity out of both calibers..at around 350 yds..because of the superior BC and SD, the 6.5 takes over and never looks back..have never tested it, only have read it.."

How many people seriously use a gun past 350 yards ?

or even 500 yards ?

Some competition shooters ? They are in a breed unto themselves.

Hunters ?
Probably not that many.