I bought a bunch of cast .358 recently from an estate sale that say "from NEC mold" and appear to be 210+gns. I need to weigh them but that is my guess. But the reason I care is they were really accurate. The guy's card said 12 gns Unique .358 from NEC mold CCI primer RP brass. Made a few up after checking some books.

Anyone heard of that brand of mold? Can you point me to them? Thank you!