Making cases fropm 348 WCF brass and hobby shop tubing is possible if you have a lathe. See my article in the Single Shot Association News several years ago. Summary: Anneal and expand to .458. Cut a 3/4" piece of brass tubing. Expand one end to rim diameter and press the case into it. Load and fire. Use a bullet of about 350 grains and a case of FFg. Match the velocity with 5744.