.357 ammo question

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The R-P heaadstamp started being used in the early 1960s. Prior to that it was REM-UMC. I agree with the earlier statement, the S&W headstamped ammo is probably from the 1970s. I remember buying some in the late 1970s, I think. It wasn't on the market too long, but there is nothing rare about it.
 
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