Amazing thread resurrection Batman!
For what its worth I solved the problem by ditching the Winchester brass and re-developing the full-power loads using Starline cases. I now have some cases with over a dozen reloads on them and they are still as pretty as new.
Interestingly when developing low-pressure cast bullet loads it is necessary to anneal the case mouths of the Starline brass so that they expand to seal the chamber and avoid "smokey" cases.
For what its worth I solved the problem by ditching the Winchester brass and re-developing the full-power loads using Starline cases. I now have some cases with over a dozen reloads on them and they are still as pretty as new.
Interestingly when developing low-pressure cast bullet loads it is necessary to anneal the case mouths of the Starline brass so that they expand to seal the chamber and avoid "smokey" cases.
