You're welcome. They are a rare bird and a particular interest of mine for many years. They are awesome guns though reality is a bit of a disappointment in some ways. The ballistic performance of the .44AMP and the .357AMP are awesome. The guns are very accurate, but reliability is spotty. They simply were not commercially successful enough to stay in production long enough to the bugs worked out.
Mac Bolan's .44 Auto Mag always worked, but that's fiction.
My interest also extends to the other of what I consider "first Gen" magnum semi auto pistols, the Wildey, the LAR Grizzly, the Coonan and the Desert Eagle.
Any of the magnum autos wouldn't be out of place in a novel, (provided it was set after they were introduced) but they're not even remotely common.
Me, I'm still trying to figure out a plausible explanation for a rich guys thug having a nickel plated 1911 on the Titanic in April of 1912....