Moses, proper twist rate for bullets thru 105-108 is the primary driver behind a 6 CM IMHO - that said, IF the mfg. would do 8 twist on all 22, 6mm and 6.5mm it allow owners to run the gamut.
I don't have any confidence the industry will change twist rates over the conventional ones that have been used for decades.
Alot to be admired about an 8 twist 243 given plethora of ammo/brass...
