Every gun is a thing unto itself. The same gun model from the same manufacture can like different ammo. Since you tried that Federal ammo, try Remington 140's or a different Federal load or Winchester brand, different bullet weights. I am willing to bet that there at least one factory load that will shoot under 1" at 100 yards out there some where. I hand load my stuff for that very reason. I can try many different velocities, powders, primers and bullets to find a good combination. Factory ammo is more limited, but in a 7-08 there are enough different loads out there that one of them should shoot straight for you.