I have 3 MP molds made by MiHa, love all 3 and they make GREAT boolits! I have noticed something odd about the latest one. Its a 4 cavity 330gr solid Ruger ONLY (normally 297gr HP, 454-297). The back cavity (the one closest to the handle pivot bolt) won't fill out reliably, I mean bad! Not the case where 2% TIN would fix, I mean the base is very rounded.
What do I need to fix this small problem? I seems to happen when my 20lb pot is less than half full.
My alloy is straight COWW, running about 680 degrees, running a pretty fast flow, NOT pressure casting, etc. I'm leaving plenty of sprue puddle too. Anything else?
My other 2 MP molds run all 4 cavities just fine.