“Why are they comparing a 6mm to a 6.5? How about 6.5 Creedmoor against .260 Rem?”
Preposterous isn’t it? No need for Creedmore...6.5 X 55 Swede has been around forever and is a terrific round. Just a sales gimmick.
I just picked the 6.5mm cartridge with closest case length to the Creedmoor. The Swede is a great round too.