The answer to your question is nowhere near the value of a standard .308 win.
Don't believe that was the question and it's unlikely anyone here will dispute the fact that a 308 Standard Rifle is worth much more than a 243 Standard Rifle.
Also, could you share the source of your information that the 308 Standard Rifle is the rarest caliber and configuration pre-64 Model 70 rifle? They're certainly not very common, but the rarest?
You really should have bought that NIB gun back in the 80's....
