KirkD
09-23-2010, 10:24 PM
I had an RCBS 25-20 PB mould that I had a fellow use before I got my own casting equipment. He cast up over 500 bullets for me with no problems judging from the bullets (seams are almost invisible).
I just sold the mould to another fellow and he is having trouble. First of all, the two halves were not closing tight unless a lot of force was used. The alignment pins were adjusted and now the mould halves close tightly with ease. The problem is that he is getting lead spines or bristles from the melt leaking into the air escape grooves, even though the two halves are tight against each other. My bullets cast from the same mould show no signs of any bristles, so this seems to be a recent development. He has started using a bottom pour pot and is using melted wheel weights. Could the lead bristles be due to the higher pressure melted lead shooting into the mould and/or a too high melt temperature? .... or is there another explanation? How can he keep these bristles from forming? I have casted five different bullets for myself since I started casting, but have never had bristles forming in the air escape grooves for any of them, although the smallest caliber I've casted is 38-40.
I just sold the mould to another fellow and he is having trouble. First of all, the two halves were not closing tight unless a lot of force was used. The alignment pins were adjusted and now the mould halves close tightly with ease. The problem is that he is getting lead spines or bristles from the melt leaking into the air escape grooves, even though the two halves are tight against each other. My bullets cast from the same mould show no signs of any bristles, so this seems to be a recent development. He has started using a bottom pour pot and is using melted wheel weights. Could the lead bristles be due to the higher pressure melted lead shooting into the mould and/or a too high melt temperature? .... or is there another explanation? How can he keep these bristles from forming? I have casted five different bullets for myself since I started casting, but have never had bristles forming in the air escape grooves for any of them, although the smallest caliber I've casted is 38-40.