This is the same silly stuff which always comes up in any discussion about the 6.5 creedmoor, and frankly, it’s nothing more than that. Sure there’s plenty of stuff the 6.5 creed will do the x55 won’t...

When loaded to their maximum pressures, the 6.5 Creedmoor uses less powder, recoils less, and offers longer barrel life than the 6.5x55 Swede, and fits into a lighter rifle. When loaded to equivalent velocity, the Creedmoor uses less powder to get there, and still fits into a lighter rifle - and frankly, is considerably easier to develop loads for.

Speed isn’t the only measure of cartridge performance. Guys were using any and all of the old cartridges on the market for competition before the 6.5 creed came about. Then some shooters asked for improvements in specific directions, which all pointed to a shortened case, fatter, with a steeper shoulder and achieving a minimum performance standard.

It’s talking out of both sides of your mouth to say a Swede has any value which isn’t also bestowed upon the Creed. Twins cannot have disparate value - such is the nature of being twins. If you don’t need one or want one, don’t buy one. I don’t have a need for a 6.5 creed, so I don’t have one. But it’s silly to pretend it doesn’t deserve a spot at the table beside its ballistic twins, just because you have an older analogy and don’t need another.