Those look like the cases available from DGW.
I've loaed .44 RF with these cases for one of my my Dad's CW Carbines. I used pulled .22 RF case for the primer, small punch to de-prime and a mallet to seat a RB. You can get a lot more sophisticated in the process, but the gun shoots that load quite well at 50 yds and very respectable at 100.
Slim