The case is not the issue, the issue is that the Creedmore is designed for different rate of twist, longer BC bullets, lead, and phenomenal long range performance, on paper, or steel. Where this goes bad in the game field is that if it isn't a TSX, Nosler partition, etc... stubby for real range shooting. It has high BC varmint type bullets, and long range performance in mind. As if they had just magically made great shooters out of everyone, and bullets that gave perfect performance regardless of the velocity they arrive at the target, with.
The case is not the issue. If all you change is the case, and you shot the same rifle with the same bullet, at similar velocity, and your shorter hunting bullet liked the long jump to the lands. And if your shorter bullet liked the rate of twist... Sure, it works just was well as the Swede. If.
The case is not the issue... Though my personal pet concept is that I like cases that were designed with feeding in mind. And my personal pet concept it I like to standardize around long action bolt guns, though that is a concept on the way out, also.
The problem with the Creedmore is when people think it is THE SAME as what was already out there, an unnecessary duplication, when it is an all new thing. The ideas are not new, but the decision to upend what the baseline for 6.5 performance is, and a cartridge primarily intended for the majority of shooters who are not hunters, needs to be recognized.