I know this problem is me and I just haven't figured it out. I have a dozen MP molds and never had the following problem.

It's a .357-125 for my 9mm's

The boolits stick in the mold at their bases on the opposite side from the pin guides. The lube grooves seem very "square" compared to some of the others. I end up losing heat in the pins from fiddling with the mold. The boolits often twist over trying to open the mold, damaging the drive band and the HP. I have repeatedly cleaned the mold and it's been through at least 6 heat cycles in the mold oven. The cavities that stick seem to be random and I can detect no flaw in the machining. It's usable but the cull rate is above 30% (not good)

Any ideas ?