Get your thoughts please. I am casting 405 gr for my 45/70 and ran into an issue. First runs had no issues once the mold was fully at temperature. I an using a Lee 10 pound pot, bottom pour. Kept temp on 9. After the first 100 on a brand new die I am getting flashing along the seam. I know this can happen if not fully closing the die but I am seeing it on about 90% now. Started seeing it on my 45 230gr rnfp as well. The lead is from wheel weights.
Thoughts on what I am doing wrong? What I can do to address the issue?
Thoughts on what I am doing wrong? What I can do to address the issue?