I'm still way new to casting and as I experience something new or different I try to mentally catalog what it means. I was casting a bunch of 124gr round nose 9mm in a Lee 2 cavity. Well into my casting session I began to have occasions where the mold seemed to stick just a bit when opening. When it did feel sticky both bullets would almost pop out.
I was thinking perhaps the mold was getting too hot, but the sprues were still hardening within 3-4 seconds. Thoughts??
Unrelated question, do you open and dump bullets with the mold facing up or down.