Its actually a Deerfield 99/44, and they are discontinued again by Ruger. I've got a Deerfield and its a sweet handling gun. Mine is very accurate, 1.5" @ 100 yards. Mine really likes 240 XTPs just under a max charge of 2400 and pushes them to around 1750 FPS.

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Couldn't get my Deerstalker to function reliably with any of my loads or some of the factory loads on hand. Would fire then stovepipe or jam in some other manner. Finally tried some loads using VV powder and its worked flawless since. Never grouped the gun--just zeroed--but its deer accurate which is why I brought it. Really dumps deer in there tracks at ranges less than 100 yards.

A point of trivia, I guess....
When Ruger brought out their first 44 magnum autoloader (Ruger's first long gun), around 1962 or 1963, they marketed it with the name The Deerslayer. Ithaca gun asked them to drop the name, as Ithaca had been marketing their then very popular slug shotgun under the name Deerslayer for years.
I'm sure a Ruger collector could tell how many of the old carbines were shipped with the name Deerslayer on them (if any were).
Last time I looked, the Ruger website had a serial number lookup feature that can tell you when your rifle was made.