Dear SirReady made cases for the .577 Snider are not available in my country. Bertram or Jamison cases? Forget it.. 24Ga shotgun plastic cases can be found sometimes but it is not a popular gauge here . Magtech brass cases cannot be found even ifBrazil is our neighbor.So, if you want brass cases you have to make them yourself.The method I used was that of sleeved cases as described by Earl Naramore’s book Principles and practice of loading ammunition.I used sleeves turned from ¾ brass tubing and discarded cases of 375 H&H or .300 Win. Mag. Or any other belted caliber, annealing, expanding , trimming and fireforming them as needed.This method has given me excellent results for .41 Swiss Vetterli, . 43 Spanish RB, 13 x 92 mm. SR ( for G 18 AT "rook rifle") and now for the .577 Snider.So now I have cases with a strong head, ( sort of an Everlasting case) and with the body and neck properties of a drawn one.At the beginning I made them with a long sleeve because the frontal part was not expanding satisfactorily on fireforming due to the low pressures involvedAfter that I devised a method using increasing diameter expanding punches that allowed me to use short sleeves.Another advantage is that this method reduces somewhat the internal volume lessening the necessity of fillers.Of course it is work and you must have access to a lathe. I am posting this information because it might be useful for those shooters who need cases in calibers nomore manufactured or those living in countries where custom regulations, or political or economic conditions don’t allow them to buy the ready made stuffLeft to right: Sleeve, Magnum case (.300 Weatherby).41 Swiss Vetterli, . 43 Spanish RB,.577 Snider., 13 x 92 mm. SR