Rich, I haven't reloaded the 308 for silhouette but I have loaded for the 7-08, which recoils less than the 308. In comparing the 7-08 to the 260 the cpt loads for the 7-08 recoiled like the ram loads in the 260, the ram loads for the 7-08 would be like the 308 155gr loads, which would be your cpt load. I would think yould need a 180 gr or higher ram load for the 308.
Drags