I gotta admit I don' t bother keeping track of single shot rifles, so I can' t say what Ruger is doing over there in the one pop department. However, in the arena of Bolt Action Rifles in Safari/Dangerous Game models and calibers....

I don' t know what the confusion is, looks like the 77 is available in 375 H&H, 416 Rigby, and 458 Lott per the Ruger website....

http://www.ruger.com/Firearms/FAProd...famid&famid=35

Never Go Undergunned,
EKM