From the 2008 edition of Gun Digest in an article by Steve Gash
"The "regular production" 700 Classic debuted in 1978 in 7 calibers: .22-250,.243, 6mm,.270,.280, 7mm Mag, & .30-06 - and was just another model, ala ADL/BDL/Mountain/etc.
Of these, only the .280 was later made in the Limited...