Sakoluvr,
Sako started making the L42 action during WWII, for a small 7mm hunting cartridge based on the 9mm Parabellum, which after the war became the L46 and, eventually, L461 actions. But those were for really small rounds like the .222 Remington.
Sako's early rifles chambered for big game cartridges were built on FN Mauser actions in the 1950's. Eventually they started making their own short action for cartridges like the .243 and .308, but it was a number of years after Remington introduced the 722.
