I have a Nikon FFP scope on a 270 WSM M70 extreme weather stainless. Nikon offered the scope with a number of reticles that were calibrated with the stadia lines at 300, 400, 500, and 600 yards (crosshair zeroed at 200) corresponding to a range of cartridges. For the 270 WSM, the ballistic drops are very similar to the 300 Win Mag (all within a few % error out to 800 yards). I think it was a nice idea, if you can find one in the right caliber, since they are no longer in production. But they have the Nikon lifetime warranty.