I'll toss you some links in the next day or two for some Enfield sites and a couple on reloading the .303. I shoot and hunt with Enfields quite a bit and even cast lead bullets for mine. Great for plinking cheap. You will enjoy that rifle I believe.
One thing, the weakest point on a No1 or No4 Enfield is the magazine and its feed lips. Don't take a loaded magazine and slap it home like you do with most magazine fed rifles. Doing so will bend the feed lips and cause you feed problems and frustration. Load it like it was meant to be loaded, from the top with single rounds or with 5 round chargers(the British term for stripper clips).
Nevada, The last free place in this country.