I'm mostly hosting this thread in the 300 BO forum.
However, I've started developing a semi custom mold suitable for 7.62x39 / 300 BLK. It casts out a 125 grains of linotype. Powder coated it ought to be more or less a clone of factory ammo.
For some reason, no one is making a mold in this size range for 30 cal. Initial testing seems to indicate that this bullet is stable and handles pressure without difficulty, but I don't have a lot of range time on it. I expect we can get it to accuracy consistently under 2moa for normal rifles in the ruskie caliber and the "modernized 8 kurz" caliber.