I have 2 moulds in .376-a 245gr BRGC and a 290gr LFNGC ,these I shoot in a 375GNR same ballistics as the 375 JDJ.
The 375 GNR is a 45-70 necked down in a TC Encore -14" bll.Both of the moulds came from Dan at mountainmolds.
If you want to try some you pay shipping I will send you 30-40 each these are water dropped /WW hardness-BHN 24.
Is the JDJ on a 30-06 or 444 case.
Sean