The Swedes already had the 6.5 Krag in production. Simple matter to convert to 6.5 Swede. Barrel making machines didn't have to be retooled. Same with the bullet manufacture plants. Sometimes economics has a say. Mauser would have charged them for the retooling.
This of course identifiews why their older rifles are in 6.5mm. Sweden was nuetral before WWII but was occupied anyways by Germany. The King of Sweden took great pleasure in riding around Copenhagen to see his people and creating fits for the SS crew assigned to "protect" him. There are stories of Swedish resistance teams messing with German supply trains and tampering with production of resources. Unfortunately there were a large number of Swedes that volunteered for the SS Viking Division and fought on the Eastern Front as well.
Bruce