FWIW, Remington acknowledge their error of originally giving the 244 a 1-12" ROT. When they standardized the tapered barrel contour on the 721/722/725 series in 1958, they changed the 244's ROT to 1-10".
The 244 was dropped when the 721/722/725 were consolidated into the redesigned/refined 700 series. The 244 was renamed the 6mm and standardized with a 1-9" ROT. Early in the 700's production run, a roll stamp reading "6MM Rem Mag" was used, but the rifles were caught before they left the factory at Ilion and the "Mag" was x'd out. If you run across a 20" 700 with a 57xxx serial number, check to see if the barrel is marked "6MM REM XXXX". Mine is #579xx.
Jeff
