If I could only have one mould for my Enfield, it would hands-down be the Lyman 314299. Cast from wheelweights, with a gas check the bullets will weigh right around 205 grs. and mic out at .314".
Well that is my one and only Lee Enfield mold. I read an article by Mike Venturino and this is the mold he used, and he recommended AA5744.
Last year I cast a bunch of these, using home made Lyman #2 alloy, used AA5744, and did not chronograph my loads. I would have to dig into my ammo box to find my load data, but I should have been pushing these bullets around 1700 fps.
I was shooting for fun, in offhand practice, and at one hundred yards they shot well.
I have also used AA5744 with cast bullets in the 45/70 and 30-06. It does so well I am not going to fool with any other powders.
Mike was getting five reloads with 303 Brass before he got case head separations. I don't remember if he was neck sizing, but that is what I did. I also used a "M" die to expand the neck.
I used my Dillion 550B to expand the neck, dump the powder, and seat the bullet. I size on a Redding Turret, trim off press, and I prime all rifle cases by hand.