It is easy to say “of course it fits.” Why doesn’t it fit in Dutch’s British Revolver or my American Revolver? The rim has nothing to do with it. The rim doesn’t belong inside the chamber of a revolver nor do the rims of the Questsch Rand 9mms come even close to entering the chamber, the round stopping long before that point.
Measurements of a German-altered 9mm cartridge and of the U.S. (Winchester) .38 S&W that I normally shoot in my Smith & Wesson Revolver (factory ammo - I do not reload this particular cartridge) are given below; The rim diameter is not shown as it will vary on the altered rims of the 9mm, and it is completely irrelevant to the fit of the cartridge inside the chamber. That diameter, we well recognize, is not irrelevant to the fit of the cartridge in the revolver, as there must be space so the rims don’t overlap, but that consideration is irrelevant since it would not create the condition described by Dutch and I in this thread, nor do I have a British Revolver to try my rounds in (my gun is a five-shot revolver of much smaller size than the British weapon).
9mm Questsch Rand (oxo St 4 43):
Base - measured just above extractor-groove bevel: 9.86 mm (0.3885 inch)
Approximate center of case: 9.63 mm (0.379 inch)
Case mouth: 9.54 mm (0.3755 Inch)
Case Length: 19.08 mm (0.0751 inch)
Bullet diameter at case mouth: 8.94 mm (0.352 inch)
.38 Smith & Wesson W-W 38 S&W:
Base - measured just above broove cut just above rim: 9.70 mm (0.3815 inch)
Approximate center of case: 9.67 mm (0.3805 inch)
Case mouth: 9.56 mm (0.3765 Inch)
Case Length: 19.53 mm (0.769 inch)
Bullet Diameter just above thin raised shoulder at case mouth: 8.63 mm (0.339 inch)
Since the 9mm case is smaller in all dimensions taken than that of the .38 S&W, the chamber is not the offending measurement in this instance. It has to be the throat of the chamber, since the only larger dimension of the 9mm is the bullet diameter measure at a point just above the case mouth, at the same position the .38 S&W bullet was measured. Both were still full seated and crimped into the case mouth. Nothing else could be stopping the 9mm with deformed rim from entering the chamber, that I can see. Yet, it is not an “illusion” that the 9mm round will not enter the chambers of my revolver, stopping well short of that. I can only reason that the straighter ogive of the bullet of the 9mm is refusiing the diameter of the throat of the chambers.
I have not referred to British or SAAMI specs since SAAMI did not exist when my gun was made, nor would have their specifications necessarily been used (if they existed - I don’t know the exact year, off hand, that SAAMI was founded) nor do I have British specs available for verification of the specifications given earlier. However, case measurements of a loaded cartridge are not the only consideration of its fit into any given chamber. It is only indication of whether or not the EMPTY case will fit.
Just my take on it. Again, there has to be some reason the cartridges tried will not fit into the chambers of the only two revolvers on this thread into which a fit was attempted.
If anyone else has any other ideas about what might be stopping the fit, please let us know.
I have exhausted what little knowledge I have about this matter.