Mauser Rat,
What you are experiencing is normal. Take a look at your molds, the Lee tumble molds have sides that are corrugated while the conventional molds have sharp corners at the grooves. It's no wonder the conventional molds are more reluctant to give up their bounty. You'll soon develop a rhythm: Pivot the sprue plate with your dowel, open the mold and then rap on the pivot bolt.
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