This video shows my progress to date with a project to produce a single cartridge that will work to my satisfaction in place of four obsolete revolver cartridges. (text continues below)
The basic idea is that the following military revolver cartridges share similar chamber dimensions:
7.5 Ordnance (Swiss)
7.5 Nagant (Swedish)
7.62x38 Nagant gas seal (Russian)
8x27 Ordnance (French)
The cartridge length I'm using is based on the location of the step found inside an 8mm 1892 French revolver chamber. The case can be made by altering either 7.62 Nagant gas seal or 32-20 brass.
BTW, I discovered that Fiocchi Nagant brass is very slightly fatter at the base than Privi-Partizan brass, so when available it is my preference for use in the French 1892 revolver.
The cartridge uses hollow-based wadcutter bullets sized to .309" and seated full length. I like Lapua bullets, which are dead soft and expand very uniformly to seal in the oversized 8mm bore.
As you can see by the target groups, I'm still searching for the ideal powder charge for best accuracy. The 1892 French revolver is the problem child, but since the target holes are all perfectly round (showing adequate stabilization) it may just come down to finding the right velocity.
This concept was based (practically stolen, actually) from a pair of videos you can find at the Bloke on the Range channel.
Videos here represent my interest in firearms and shooting. I prefer demonstration over dialog. I make these videos quickly following a repetitive format. My camera is cheap and I use free editing software. You've been warned!