ChrisG
AH elite
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Standard twist for a 6.5x55 was 1:8 if I believe. That's what my Ruger was. The Swede M96 was twisted for the pencil-long, 160 grain RN FMJ. I believe they were a 1:7.8" if memory serves. Fast twist barrels have been around for a long time. The only 6.5s that didn't have them were likely the 264 WM and the 260 Rem. Americans at the time had no interest in long bullets, just high velocity. The old swede has always been as good or better than the creedmoor at lower pressure.The advantages of the 6.5 Creedmoor and other "new" cartridges has very little to do with improvement in the cartridge design and everything to do with the barrel design. Standard cartridges were designed for standard bullets- bullets that used rifling twists of 1-10" or slower. New cartridges are using bullets of new design in that they have a lot of length to bore to gain high ballistic coefficients and thus need fast twists of 1-7". For the new cartridges (6.5CM) the barrels are 1-7".
I suspect if you had a match grade 1-7" twist barrel chambered for 6.5 x 55mm that it would be very competitive against the 6.5 CMs.