I just aquired an Enfield from my grandfather, the only markings on the rifle are stamped into the "strap" looking piece from the bolt to the trigger area and it reads "1942". I can faintly see what looks like used to be stamped very lightly into it "E303" and that is also stamped on the side of the magazine that touched the trigger assembly area. I assume the "E303" means it's a british 303 caliber, my grandfather said thats what caliber it was too. A few years ago i was going to take it to the range and stopped to buy some rounds for it at a local gun shop and the guy at the counter took a 303 round he had and showed me how it would'nt fith in the end of tha barrel and refused to sell me the rounds so that i wouldn't "blow myself up". Was he full of shit or is it really a .303?