If I may make a suggestion, the Canadianicon members here could try and contact Jim Bullock he was on the Canadian shooting team and also pressure tested thousands of rounds of ammunition.

Mr. Bullock would be an invaluable source of information on the Enfield Rifleicon on the very subject we are discussing here. Oil or water in the chamber can cause the headspace to increase faster than with a dry chamber and is directly related to chamber pressure (.303 vs. 7.62)

Don’t wait for Pearl Harbor or Singapore to be attacked first again, gather information and prepare for a immediate counter attract.

Jim Bullock
“I have pressure tested thousands of rounds of ammo in many different calibers both professionally (years ago) and more recently using the facilities of the Canadian Gov't (Explosives Branch) and Expro (maker of IMR powder).”

http://www.smellysmleshooters.net/ammopressure.htm