They were made in 8X57, 9.3X74R, and 45-70. (I had a 9.3 but 'Tarawa' talked me out of it.)
Several of the 45-70's were rechambered into 450 NE #2 . Possibly that is what you saw? There 450 NE 3 1/4 wouldn't work becasue the rim is too thin for the 45-70 rim recess IMO.