Whatziss you say? a Fotay Revolver? Ain't no sucha thang, you say. Yes there is, and I own one. It is the Charter Arms Pitbull snubbie in 40 S&W caliber. Charter arms deals with the concept of using rimless ammo in a revolver by a mechanical construct which projects little tabs out of the ejection star to grab the cartridges by their rebated-rim channel for ejection. The cartridges headspace themselves in the cylinder by the mouth of the brass.
When you think about the 40 S&W, it is simply a larger semi-auto cartridge than the 9mm Luger, and it will handle the pressures that a Nine will, up into the mid 30,000 CUP range. 38 Special, even in +P+, won't take over 20K-CUP. 45 ACP, same as 38 Special. 357 Magnum will take up into the low 40,000 CUP range, but for most snubbie applications, you have to load it down well below what it will take.
So, the Fotay makes a decent snubbie cartridge. Out of the Charter Arms' 2.5" barrel, it will make close to 1,000 fps in most defensive loadings, and closer to 1,050 fps in the lightest bullets.
I am currently loading some 40 S&W for my Pitbull in 135-gr, the lightest bullet commonly available. I get these from MidwayUSA, which house gets them from Rainier Bullets. They are Copper Plated Lead Truncated Cone. The first batch for testing will be shoved by 6.2-gr of IMR Hi-Skor 700-X. Federal Small Pistol primer lights the fire. In a 4" test barrel, these get 1,210 fps, which would be 439 #/ft muzzle energy, about a third more than a 9mm out of that barrel. Out of the 2.5", with a cylinder gap to jump, I will likely get 1050 fps, translating to 330 #/ft muzzle energy, about a third more than a 38 Special loading out of a snubbie revo. For comparison, the NATO 124-gr 9mm war round gets 336 #/ft out of a 5" service auto.
After the 135s, I will load some with Hornady Action Pistol JHP-180s. This is a bullet designed for the competition crowd. It has a tough hide of copper to handle metal targets, unlike the lightly-plated Rainiers. It will make decent penetration, pushed by 6.0-gr of Unique out of the snubbie at about 950 fps, giving me 361 #/ft of muzzle energy, just a tad more than 45ACP military ball gives. I have a 1911A1, and it weighs twice as much as the Pitbull, carries 3 more rounds and does not easily conceal. My shoot-all-day Glock Model 22 doesn't conceal well, either (no Glock double-stacker does).
The revolver, with two reloads of ammo, gets me to my rifle, in the case I can't end the fight with five rounds, but that's why we make lots of ammo and practice a lot, isn't it?