Beco Inner Space Products On-Line Catalog
.357 Hawaiian Sling PowerHead

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This all stainless steel PowerHead is available with a barrel that accomodates .38, .38 short, .38 special, .357 Mag and .357 Max calibers.  An extra feature of this PowerHead is that it's barrel can be interchanged with the barrel of the .223 PowerHead.  To waterproof the shell, the manufacturer suggests using fingernail polish around the primer and also where the bullet presses into the casing. 
Weight: 8oz Opening: 3/8" or 5/16"
Threads: 6mm, 7mm, 5/16-24 Price: $143.90