I scored what appears to be a new old stock Lyman 454424 dual cavity mold(orange box..hand written numbers)
Anyhow..from what I've read the this mold number has been modified a couple times as far as groove contour and has been superceded by another mold in the Lyman catalog.
This mold seems to have the old type square grooves that I guess could be problematic as far as releasing the bullet. I've been using mostly LEE aluminum dies lately...any advice for breaking in and using a nos Lyman mold??