Being that it’s a Finnlight ,I would go with the Conquest 3-9 x 40 or the 3.5-10 x 44 as previously mentioned to keep the weight down but if you’re going to use some Optilock base and rings then it doesn’t matter because the lowest rings can still handle 50 mm obj. lens if you so desire. Hope you enjoy your 270 WSM Sako as much as I do. Good luck...

Just to add, the 3-9 Conquest has a constant 4” eye relief and the 3.5-10 has 3.5” of constant eye relief , in case you’re interested...