Thanks for the welcome, Grasshopper and HunterJim!
That's a very interesting point on the CZ and ZKK magazines, HunterJim. I haven't seen anything specific on that but I wouldn't be surprised, since that sort of detail seems to be exactly the sort of thing that would get dropped, either as a cost cutting measure or out of simple ignorance. The kind of thing that gets lost as institutional memory fades - i.e. the stuff that wasn't written down before the old timers get fired (because they were paid "too much") or retire - and then people realize the stuff doesn't work as well any more.
One of the most interesting sections in Speed, Schmid and Herrmann's book is only a couple pages long - it gives the measurements for the magazine boxes for original Mauser sporters for the different cartridges chambered. In some cases the difference is only fractions of a millimeter. I wouldn't be surprised to hear that there were different measurements for the receiver feed rails as well, depending on the cartridge.
