The term came about in reference to the pre-1964 Model 70s. I don't recall just when, but likely in the 1970s. While later model rifles from various manufacturers may shoot equally tight groups--or even better--that's beside the point. It was the mix of well-made as to the machining and well-fitted as to the wood that gave those Model 70s that nick-name. At the time, few mass-produced rifles could match those old rifles for the "fit and finish" we see today.