I used to do that but I never found where the best load with the working scope was any better if it was worked up with a more powerful scope. In other words if I work up a load with a target scope it might be a .250" group but when fired with the low power hunting scope it was a .500" and if I would have worked up with the low power scope to start with it would have been a .500" group so nothing was gained using a target scope.
I use the high magnification scopes because I perceive that doing so allows me to aim smaller, hit smaller, and the reticles tend to be finer than those of my hunting scopes. On a game rifle, I have come to prefer a reticle like the Leupold heavy duplex that is going to be visible under first/last light conditions and since I am much more likely to shoot something under 300 yards than over the portion of the animal covered by the thicker reticle is inconsequential.
