Cost of cases, for starters. Cost of rifle, second. Availability of cases (.338 or .458 always available). Ease of building a custom rifle: any old Mauser 98 or standard-length Rem-chester is perfect.
Even recoil, when you get down to it! The Rigby needs significantly more powder than the Taylor for the same velocity.
On the Rigby's plus-side, much lower pressure. And plenty of room to juice it up, if you're one of those people who needs to do such things.....
Don't mistake my post for a dislike of the Rigby: I'd kill for an original John Rigby Magnum Mauser chambered for the cartridge!
-------------------- Marrakai
When the bull drops, the bullshit stops!
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www.marrakai-adventure.com.au