I started doing some casting yesterday and everything went okay after a while when casting a .358 150g six cavity mold. Had some stumbling blocks along the way when I first started which got better as the mold got hotter and hotter. Today I wanted to do some more casting and that worked out pretty good too, I did some more .358 150g and most of them turned out pretty good. I then used the .358 105g six cavity mold and from the beginning to when I decided I didn't want to do anymore casting, every single boolit from every cast came out perfect from beginning to end.
I then tried my 45 cal mold and I had creases in the boolits, there were a few that were good but the bad out-weighed the good. I stopped with the 45 cal mold and went to trying the 308 rifle molds. This is where I am stuck, every single cast for the two rifle molds that I casted came out with creases in every boolit. I took my pid up to 810 degrees and put the molds on a hot plate but still nothing changed.
How come the lighter grain boolits are coming out much better that the heavier grained boolits? Anyone have any ideas? I get all my lead from the members here and I am not sure of what else I can try. After reading all the info dealing with the good and the bad I knew that I had all the areas covered. My molds are new and I made sure that I cleaned them out two weeks ago from the oil and whatever debris that was left in there after the manufacturing process.
Appreciate some feedback, I really want to see my heavier grained molds casting properly.
Thanks