Are USGI .308 and 30-06 FMJ bullets interchangeable for reloading?

[old tanker]

The Springfield 1903 rifle was initially designed to shoot the 220 grain round nose bullet that had been used in the Krag. After the Germans started making ammo with pointy bullets, US Ordnance hastily replaced caliber .30-03 with .30-06. They did not bother to change the twist rate. Many manufacturers still use 1:10 twist in .30-06 and while using 1:12 in the same model rifles chambered for.308. One reason the -06 is a better choice if you like heavy bullets.