I searched and found conflicting or ambiguous info. I see that tikka has a different part number for a 6.5cm mag than for the 308-family mags. However, I've found numerous references suggesting they are the same, or at least interchangeable. It appears the 6.5 mags work for 308 and allow a slightly longer cartridge length. Question is whether the standard 308 mags will properly feed with factory-loaded 6.5cm ammo/rifle?