I have a couple of early pre-prefix Ruger No.1 in .243 Win but no .30-06. I just won a nice early .30-06 No. 1 barrel with front sight and barrel band on gunbroker so I'll be ready to make the change in the near future.
I know the extractors are the same and the headspace should be dang close so those should be not be a problem IF the barrels index up correctly. Question is: does anyone have any experience with swapping or rebarreling Ruger No 1s? Hopefully they aren't as bad to change barrels in as the Ruger DA revolvers