Reading pressure signs on mild straight-walled cases like .38 Special can be grossly misleading and often a waste of time.
I can load a +P+ .38 Special cartridge and fire it in a Model 686 with no particular definitive pressure signs, and no danger.
The identical cartridge in a WWI .38 special revolver may only show ONE pressure sign: the top strap hitting the ceiling.
Reloading tables and chronographs are your friends.
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Science plus Art
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