Make sure to do at least 5 heat cycles before you use it. It really helps the first use of it. And coat the pins in graphite of some sort. That really helps. Even a pencil is good. When these are working they are great. And some pins are easier than others to use.
Congrats too! I have a new MP 40-160 mold too and plan to use in next week. What powders are you planning to use with your cast bullets?
I have found these powders most accurate in the 10mm...
Aa9,powerpistol,hs6,unique,and longshot.
Probably powerpistol is the best, if i could only have 1. But i have shot more inch groups with aa9,then any other,,but it loves to run wide open,,powerpistol will run wide open as well as ultra slow,so pp is very versatile