I don't remember if I have ever loaded for a Sako M 75.Most of all the Browning A-Bolts have short magazines not allowing for space to reach the rifling. Does the Sako M75 have the same trait?
The inside measurement of my magazine 300 wsm Sako 75 SM action is 2.955 SAAMI IS 2.850 oal for that cartridge. If ever an action was designed for a 300 wsm this is it, feeds cartridges like they were greased and top loading thru is easy and troublefree. I am very pleased with this gun.