I'm having some problems with a mold. It is the RCBS 44cal 250K. This mold has a lot of very square profiles/edges and some boolits are not filling out well (rounded edges, not square). I have been culling any boolits that the front driving band has not been sized at all.
The mold has been well cleaned and used several times...I preheat it on a hotplate.The alloy I am using is 1 part linotype to 3 parts pure lead, so I think I have enough tin in there. I am casting at 675-700 degrees.
Is there some tricks to getting better fill out with molds of this type? More tin to the mix? Hotter? Cooler? I'm getting to many rejects.
Thanks...Shooter