I'm a pretty new caster. I've been casting for 6 months or so. Just a couple days ago I received a KAL adjustable PP mold and I'm having a bit of trouble with it or, rather, with me. I'm sure it's not the mold, which is really a beautiful little piece of machining work.
The problem I was having was a couple type of finning or flash showing up. I had a little fin on the base (between block and base plug) of the bullet a large percentage of the time. I have the set screw keeping the base in place tightened very modestly. I used the end of an allen that gives less mechanical advantage and just used two finger pressure. Could it still be too tight?
The other problem I had was getting little needles of lead that had flowed into the vents. Do I simply have the melt too hot? I didn't really know how to treat this mold so I copied what I do with my BACO money mold, which cast beautifully with these parameters.
I'm casting about 30:1 lead:tin and I kept the melt temp. hovering between 800F and 820F. I ladle pour them and I keep the spout in contact with the sprue plate until lead starts to come out of the sprue hole then I make a sprue puddle.