Djandj,
I guess your trip to the range answered my questions. Did you fix the headspace issue?? I wouldn't reload those brass cases unless you have a 54r die with a double shoulder![]()
IMO the 182 gr 54r is a long range sniper load for a rifle. I don't know of anyone who has used it in a Bren. The only experience I have is the steel cased "light ball". You may be in uncharted territory.
You might try to mike the brass case at the locations shown to see if the bass is bulged.
Does the Gun work properly with a .303 barrel ?
IMO you haven't "traded problems" its the same problem.
Joe