Does anyone know if Winchester ever made a rifle in .30-03? I am thinking that it might be a .30-06, but somehow got stamped wrong.

A close examination of the chamber would give the actual chambering.

Then, you could start the research from there: If it is chambered for .30-06, the place to start would be to determine how .30-03 got stamped on the barrel.

If the chamber is .30-03, then a search would be in order as to when and why Winchester made a M70 barrel in this caliber.

As someone said, the .30-03 has been obselete for many years, and I can't see Winchester making a .30-03 barrel for a cartridge this old. Maybe it was a slow day in the custom shop and someone got bored.

Or, it could be what it is thought to be: a original M70 that left the factory chambered for .30-03 and stamped as such.