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the OUTSIDE diameter which is the same spec for .38 and .357
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Is it that you don't know what the "rim" is? It is on the "OUTSIDE" of the case.
The point being...
For safety's sake, the case walls are to be assumed to be "same spec for .38" not beefed-up for the extra powder/pressure. S&W maybe leery of that particular design using
above spec pressures with
spec case walls.
Yes, "there
can be differences in different manufactured brass" which S&W has no control over. Who am I to conclude knows what is best for this specific design?
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Yes, but those variations take place INSIDE the case.
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The case wall thickness issue I present is not a (does it fit?) issue, it is an issue with the case wall experiencing
above "spec" pressures.