I have a 6.5x55 (stubbed Shilen) and a 260 Remington(rebored 243 Superlight), both done by Wayne, also have a 6x45, there is no 6.5(.264" barreled H&R, as Blake said, the only way to get there is a stub or rebore, without one of those, the closest they get is .257"(25-06) or ..277"(270 Win).
Tim