I remember reading a short article in the American Rifleman back in the late 1950s about a guy who rechambered a 6.5 Arisaka to 30-06. He took it to a gunsmith, complaining that ever since he rechambered it, the recoil was unbearable.
A shooter purchased 308 W ammo and then took off for the range with a rifle that had a 25/06 chamber.

F. Guffey