Gunload Master
The 15mm cf is an overshot honestly, a black powder scarce antique French and little known oddball from 1890. For the record, an old Eleys' Cartridges advertisement listed a 15M (mm) pinfire, around 1886. Did these guys have fun or what?
You'll have to draw a line somewhere and keep guys like me under control :) .
The "11mm" Montenegrin/Gasser are a confusing group of relic calibers, if only because shooters are not ctges collectors and don't realise they were several different rounds.
(Helllp! My chambers are not standard....! Right..., a bunch of these guns were made in Belgium too..... The montenegrin prince, who happened to represent the Gasser Company..., decreed that every militia member had to carry full-time; the militia actually covered every male adult ... can you believe that? )
So we had a 11.5x36 (.444) bottleneck around 1900,
a 11.4x17.5 (?),
a 11.3x33 to 37 (.454, first Austrian Gasser service round, 1870) ,
a 11.2x29 (.448, 2nd Gasser Austrian service round, 1882),
and a 10.8x23.5 (.425); according to my reference*.
The first service round was dropped by the Austrians because its dimensions were similar to those of the 11.5 Werder, 50% more powerful ... and bottleneck; accidents happened..
If you decide to add them to the list, I would suggest one single entry with warning.
The guns do come up regularly on auction sites:
http://www.gunsamerica.com/guns/976677128.htm
here's a list of old calibers (no sight of the Gasser/Mont.) :
http://www.david-squires.org.uk/Antiques.htm
The same, in pdf:
http://www.cybershooters.org/PDFdocs/antiques.PDF
* : Handbuch der Pistolen und Revolver Patronen / Manual of Pistol and Revolver Cartridges , bilingual. 1967, Verlag, Germany.
kg
PS: There's also the quite popular .400 Corbon; I'd like to get a 1911 bbl in that caliber this year, but where in Canada am I going to find it ????