After a year and 8 months the MP-Molds-Larsen-C432-250-RF-for-44-Special/ Magnum 444 Marlin is finally here. The fit and finish is better than the last one if that's even possible. There was no breaking in the sliding pins and main pin fit was perfect. It's 240g with the Penta pin and my .432" mold casts .4325" with 95.5/3.5/1 Alloy. The batch I measured were within .0005" across several axis all the way to the ogive.
I disassembled the mold and cooked it for 2 hours on a hotplate at medium to drive off oil and oxidize the mold. The IR thermometer was down but it was about 350F. the mold oxidized evenly without cleaning first, so soap or solvent is a wasted step. A master tool maker said heat was all you need so I tried it.
The mold casts like a dream. I preheated the mold on a hotplate (1/4" steel plate on top) and had good bullets on the second cast. The Pro Melt 2 was at 700F and I emptied the pot.
Several things different about this bullet. It sits very far forward, the forward drive band will be in the throats of some revolvers. More room for powder if you are using a really slow powder. The grease groove is small, potentially reduces smoke.
The 3 bullets shown from left to right. 432 Hammer, 432-640 and 432 Larsen
I have 100 loaded and will try to get to the range this weekend.