I got to cast my first boolits over the past week, with fairly good success (for a beginner). I cast some .38 SWC from a steel Lyman mold, a .45 colt at over 300 grains from a Mihec brass mold, and a .308 from an aluminum Lee Mold.
Now here's the question: The 300+ grain from the brass mold keep shearing off the center of teh sprue - as shown here:
I couldn't get it figured out no matter how fast I casted, how hot the mold/melt was, or how fast/slow I cut the sprue. I know the answer lies in there somewhere, any pointers?
BTW, I didn't have teh same problem at all with either the Lee .308 or the Lyman, as pictured:
Thanks for any ideas of what to try next round. I figure they'll still shoot. I had about a 50-60% cull rate for now, but I didn't cull them until after casting, to keep the molds up to temp.