I see RCC Cartridge company is closed. Can somebody tell me if they plan to open again?. I need some 4 bore cartridges made

Not sure about RCC, but I see JJ Perodeau will load 4 bore:

https://jjperodeau.com/services/

https://castboolits.gunloads.com/showthread.php?449465-RCC-Bankrupt&p=5483501

RMC sells unloaded brass 4 bore hulls. I have a bunch of their 10 gauge brass hulls and they are very good. http://www.rockymountaincartridge.com/

I have 30 eight gauge cases that I will use forever.