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They are not the best rifle for handloader as the brass life is short except in the 303 rifles made here in the states during the war for the brits useing the Eddistone and Remington made rifles.
Kinda mixing apples and oranges here. Remington, Eddystone, and Winchester produced Pattern 14 rifles in WWI, a mauser type action. Not anything like a Lee Enfield, except in caliber. Winchester also produced their M1895 levergun in .303, so there were several different rifles available in the caliber.
Savage did build No 4 rifles in WWII, but those are the only Lee Enfields built in the US. The headspace/brass life issues are real, but can usually be minimized. The .303 headspaces off the rim, but chambers were often cut long to insure functioning in dirty/muddy environments. The military didn't care, they were not planning on reloading! If you allow the brass to blow forward once, no problem occurs. It is the constant resizing, and pushing the shoulder back to factory spec that does the damage. After the shoulder blows forward the second or third time, you are usually going to get a case head seperation. Neck size only, and allow the headspace to be controlled by the shoulder instead of the rim, and segregate your brass by rifles, and headspace becomes much less of a problem with these rifles.
I could hunt the rest of my life with a Lee Enfield with no problem.