Jim K

Our American .303 brass falls apart too soon when reloaded and I read that American factory ammunition is loaded to below 43,000 CUP.

Our Enfields are stamped with a normal working pressure of 18.5 tsi or 41,400 CUP, I have also seen 19 tsi, 19.07 tsi and 20.71 tsi listed as the operating pressure of the Mk.VII or Mk.7 round.

Our American reloading manuals list the max chamber pressure as 45,000CUP or 49,000 PSI transducer method, if our American made cases are rated by the factory for 18.5 tsi or 41,400 CUP this explains why the cases fall apart at the higher pressures.

SOME people blame the Enfield for having a weak action when our American brass cases appear to be the main cause of the problem.