A tumbler is not necessary unless you need the brass to look shiny. Hot soapy water will work just fine. The only downside in my opinion is the time it takes to dry
Any 38 special dies will work for 38 or .357. There might be some .357 dies that won't work for 38 special. The sizing dies are not the problem, the expander and seating dies might not be able to reach the shorter brass.
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