I had a pattern 14 Enfield made by Winchester. It looked just about identical to the 1917 U.S. Enfield except of course for the caliber.
I think I read somewhere that these actions are or were in great demand to be converted to 45-70 since they were made for a rimmed cartridge. I might be wrong in the caliber, maybe it is some other rimmed cartridge but the 45-70 sticks in my mind.
Since the 45-70 is much fatter than the .303 it might require a lot of work to convert.
I had a terrible fever for this 45-70 rifle a few months back.