"Krinko, what you say is true for any rifle, whether Lee-Enfield or not, whether the cartridge is rimless or not."
Different rifle systems have different margins of safety at the breech because of their individual design features---so it's not AS true for all rifles.
The cone-breech system used in the US '03 Springfield/'17 Enfield comes to mind as perhaps the least forgiving.
-----krinko
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