Tell me what I am doing wrong. I have a Mi=hec 360158 SWC 4 cavity mold. Mold is flat base and solid point. I cast with it last night and really did not do very well. Pot is a Lyman 20 lb. with a PID control. Lead is range scrap from a Bullseye pistol range.
Temp. was set at 700. Mold was pre-heated on a hot plate. I could not get a nice square corner on the base and the edges of the crimping grooves and grease grooves were rounded and frosted on a lot of the boolits. I cast for about 1 1/4 hours and had around a 50% reject rate. It took quite a while for the mold to start to produce acceptable boolits, like the mold was not hot enough. The first boolits were wrinkled. The mold was on the hot plate a good 15 minutes before starting to cast.
After quitting with the Mihec, I started casting with a RCBS 358 - 158 gn. RN. Bullets were almost immediately acceptable and a very low reject rate. I cast more "keeper"RN boolits in 30 minutes with a 2 cavity than I did with the 4 cavity.
Weighting the bullets today showed the RN were much more consistent weight than the 360158 Mihec. The RN were 156gn to 154.5gns. The 360158 were 155.0 to 151.0 for the keepers.
What needs to be done to cast equally well with both molds.