Over in the Lee-Enfield specific forums of this site and the attached Jousterforums there have been several long running and not always objective discussions of this subject, the Lee-Enfield rifle and its characteristics and the obstacles you run into when trying to get long case life when reloading.
I will post several links to get you started.
Inherent Weakness
Long discussion recently closed due to degeneration of the discussion.
Case life in #4 rifle rebarreled to 7.62
Active thread.
Cases and Enfields and Lube ...Oh My!!
British pressure and a soup sandwich.
Just remember to wear your wading boots because it gets deep due to the emotional trauma caused to some posters. After you read a lot of this you will have to heave it into the air and see what parts blow away in the wind. Like the Clint Eastwood movie you have to figure out "The Good, the Bad and the Ugly".