I have heard the Arisaka 7.7 can fire the British 303 cartridge but not the other way around the Japanese cartridge case being longer so would not chamber in the Lee Enfield from what I also recall the 7.7 round is semi rimmed
Interesting......have numerous Enfields & a quantity of mil-surp .303 ammo, will check my cartridge books to see how close it is. Has anyone else tried this or know if it will work?