I'm going out on a limb here and say NO to that one RR. zrex, case parentage goes back more than just the first generation. You do know that the .308 case is based off a .300 savage right? And you do know the .300 savage was based off a 250-3000 Savage right? Care to guess what a .22-250 case is based off of??? SURPRISE!!! .250-3000... Now...want to guess what the .30TC is based off of??? Well actually it wasn't!! It was basically TC and Hornady trying a rimless cartridge with damn near identical dimensions of the .308, though a tad shorter and getting a bit more speed than the .308 with their formula factory load. Easy to manipulate that data but I digress. The point here is zrex, you can form a case for the 6.5CM from just about any case from the 250-3000 family. In all actuality, a .243 case makes a fine 6.5CM case!