Model 8 barrel diameters?

[Bill in Oregon]

Hey, does anyone know if the barrels on the four Model 8 calibers are the same outside dimension at the narrowest point, or were they turned to different minimum diameters based on the cartridge to be chambered?

[1913Model8]

I am working on recreating the FN barrel tool, A guy from Canada on here confirmed that his 25- 300 savage all have the same outter dia. of the barrel cap that surrounds the barrel. The outter barrel dia. Itself i would imagine is different.