Coonan has been around for quite a few years. IIRC they went bankrupt once and have just come back in the last couple of years.
They are are a modified 1911 chambered for the .357 Magnum. The grip frame is longer front to back to accommodate the longer cartridge. Some people don't care for the feel of it.
I got to shoot one once and rather liked it, but not enough to buy one. Them things are expensive.
i have the new one and i love it. it came with 2 springs one for 38 i believe is a 10 pounder 357 is a 20# it take the same recoil springs as 5" 1911. i have every one from 8 to 20 at the price of the gun i don't want to damage the frame so i pick my springs for the reloads i make. i have no problems with feeding untill i got down to the lightest reloads. wich seems like to much hammer spring to overcome. i love my coonan and glad i spent the money it is very well made and shoots more accuret then i ever will.
I have owned two. Both shot very well and had no trouble with quality factory ammo. They are very loud at an indoor range. Will draw a crowd. Got talked into selling both and the $$$ went into something else I was more interested in at the time. Do not see them very often. People that own them seem too hang on to them.