I shoot cast in my TC 375 GNR basicaly the same as a 375 JDJ,I cast my own 245gr BR- GC and a 290gr LFNGC I use water dropped/WW BHN 23-26 (sized .376).No leading at all.
I dont know of anyplace you can buy them,If you dont find any ,email me I will see what we can do.
Sean