I am a 'Relatively' new Ruger Shooter as I bought my First Used Ruger Revolver in late November 2015.
It is a New Model .22 CAL. Convertible Single Six that I had custom converted to a Center Fire Single Eight in .25ACP, and other Cartridges, with a 10-5/8" long barrel.
The end of June 2016 my Second Cylinder was finished by my gunsmith in ".250ALRM"; a .25ACP diameters "wildcat" of 1.250" case length. I also have some other 'Mildcats' I can shoot through this revolver now:
"6.35x26mmSR Stewart" of 1.020 through 1.056" case length, I currently am trimming to 1.055" in my experiments.
This is the same Case length and overall length as a .22WMR cartridge and also has the name ".25 Magnum Auto" and ".25MACP".
"6.35x28.6mmSR Stewart" of 1.125" case length. This is the Same length as the old .25 Stevens Rim Fire Cartridge.
"6.35x32mmSR Stewart" of 1.250" case length. the same case length as the ".250ALRM" but made from a 5.7x28mm Case.
All the 'mm' case designations are Made from Resized and trimmed 5.7x28mm FN once fired Brass.
All the "inch" case designation sar e made form Resized and trimmed .22 Hornet Brass (mostly new PPU brass).
So far I have loaded 50 grain FMJ and 63 grain Lead bullets ahead of BE-86, Power Pistol, Bullseye, Or Unique.
weakest fired to date is Factory Prvi Partisan 50 grain FMJ .25ACP, and the Strongest so far is 3.0 grains of BE-86 behind ^3 Grain Lead in a .25ACP case.
Left side of my Ruger .25ACP Single Eight, with Cylinder installed.
Right side of my Ruger .25ACP Single Eight with cylinder removed and Loaded with cartridges.
Close up of the Modified 8-shot cylinder. It is still marked as '22-MAG' though.
Eventual Plans is to have four separate Cylinders, one for each basic cartridge designation/case length.
I have not yet come up with a method to remark the cylinders in their actual Cartridges without the chance of distortion.
I also have a Stevens "Favorite" converted to Center fire and use a ".25 Stevens" barrel to 'plink' with .25ACP rounds.
I can fire 6.35x28.6mmSR Stewart in it if I down load to about Trans sonic Velocities (about 1124fps).
Best Regards,
Chev. William