A few that are missing are the following:
Austro-Hungarian 7cm M99 Mountain gun. The case dimensions for this are:
Mouth Dia.: 74mm
Case length: 63mm
Rim diameter: 82mm
There is another odd case I have which measures 75 x 330R, rim 92mm. The only headstamp is “L.37.” In identical font to French cases from around 1900. There is a similar case with a 90mm rim listed in Robert Hawkinson’s list as “Possibly French for the Boers”. So I also believe this is what this case could be. I know nothing else about it, it was a car boot sale find.
There is also the 100 x 92R (111mm rim). This is similar the the British 3.7" Howitzer, but is marked “95MM SP & INF”. Mine is dated 1944.
Finally, you list the 76.2x405R 12 Pounder 12 CWT which is the fixed round. There is also the separately loading one which was 78 x 390R with a 104mm rim.
When you plan to go above 128mm, I can give you the dimensions for the Case for the British 6" Mark 5 Naval gun.
I hope this helps.