I don't see the point of a case that big with a 6.5mm bullet. The BCs on the 6.5s are not that good and work well in the existing chamberings (6.5-284, 6.5-06, 260, 6.5x47L) because it is a nice balance of accuracy, recoil and drift resistance.
A case that big is much better utilized with the wonderful 180 grain VLD type bullets with the attending much high BCs. A 7WSM shooting 180 Bergers has less wind drift that the 26 Nosler shooting 140 Bergers much faster.
The 6.5-284 and 6.5-06(AI) are about as much powder as I would ever put behind a 140 grain bullet. There is no substitute for a bigger bullet- none.
