I have 4 Lee Enfields so it's a bit if a juggle to keep the brass separate, but an important step since neck sizing really is the way to go to get more life out of the brass. I would focus on using the best brass you can find, I have found Privi and Hornady work well, whereas S&B has challenges, must be soft brass, not sure but it doesn't hold up as well. Best powder for me so far is IMR 4064.
I have heard that Enfields shoot non boat tail bullets the best, but I personally haven't found much difference in my loads, ymmv.