When the testing on oiled cartridges described by Reynolds was being done, they'd begun greasing the guns with Mineral Jelly to hold down rust, and Rangoon oil as a CLP for moving parts.
Tests were run with Cartridges dipped in Rangoon Oil and allowed to dry for two hours, then dipped and allowed to drain for one minute, then dipped and inserted directly into the chamber.
They then tested dry cases with a ring of Mineral Jelly around the neck, I suppose to mimic a chamber neck still partly greasey while the chamber had been roughly swabbed out in a hurry.

Results are found on page 95 of the Lee Enfield Book.

PS
Pederson used a patented dry lubed case.

Due to corrosion cracking of cases exposed to ammonia vapors in stables and in India in the Monsoon season I suspect lightly oiling cases was necessary to protect bare brass.