Today I was using the mold 314299 and I noticed that one side of the boolit in the back cavity had an area that impressed frosty and gave the impression that it had not filled well.
I measured it and indeed, it lacked filling. Here the photos.
I raised the temperature in the Lee oven and loosened the sprue plate a little, and it improved for a few moments, then it happened again.
I still don't have a lead thermometer.
Any ideas?